For a moment Robin felt dizzy again, and the falling sensation wracked him. It was the weightlessness, he knew. The sensation of being without weight was the same as that of being in free fall. And he was operating beyond the effects of gravity. Somehow the atomic rocket fuels had been far greater or far more effective than the inventors had calculated. He knew that they had never intended this rocket to be shot beyond Earth's grip—for if they had, they would not have loaded it with the test animals and they would not have placed a parachute-release arrangement in the nose.
However, it now occurred to him he might be wrong about this. He had seen the reference to the parachute on the loading chart, and he now remembered lettering indicating parachute on the body of the rocket just above the little entryway to the topmost cargo compartment. Still, perhaps there was no parachute there.
He squirmed around again, trying to get used to the nauseating sensation of free fall. He felt as if he had to exert conscious effort to keep his stomach from turning inside out. He felt an impulse to scream, to thrash his hands, and he had to remind himself that it was an illusion.
For a while he just rested, floating in the little space, bumping steadily against one wall or another, with barely inches to spare. The tiny burning sunbeam pierced through again and vanished. Robin looked through the peephole.
It was the dead black of outer space now, a black beyond conception, black with nothing in it to reflect. And against it an inconceivable array of brilliant points of light—the stars in numbers beyond any seen through the blanket of atmosphere. White, with some yellows and reds, and a few bluish ones here and there. The Earth moved again into sight and it was distinctly smaller—though still an impressively vast bowl—but beginning distinctly to resemble a monstrous globe in bas-relief, breathtakingly impressive with its living face, its shifting misty veil of air and water vapor.
Robin became aware that he was thirsty. Yes, and hungry too. He took stock of his situation. He felt through his pockets, came up with one of the candy bars he had taken. He hefted it thoughtfully. Should he eat it now or save it?
That raised the question he had been unconsciously avoiding. Save it for what?
If he was indeed heading for the boundless regions of space, then he was a doomed man. If he ate now, it would mean that starvation would come sooner. If he delayed, doled it to himself in small bits, it could only prolong the agony awhile, but would not the result still be the same?
There was the chance, the odd chance, that the rocket somehow might yet return to Earth. It might describe a circle, an arc, finally begin to fall back. If it did so, the parachute would operate and perhaps land Robin in safety.
Somehow it didn't seem likely to Robin, yet that chance existed. If so, it would have to return to Earth before a full starvation period could result in death. Robin had read somewhere that one could go without food for as much as thirty days, but without water for not more than seven or eight. If the rocket were describing an arc or a parabola, then it would surely start its return within less than that week's leeway.
With this in mind, Robin unwrapped the candy bar and ate it. The second one he would save as long as possible. But what about water?
The squeaking of the test animals broke in on his thoughts. Surely they must have been supplied with some sort of food for their flight? Robin switched himself around to face the floor and began to dig at the padding there. He managed to loosen it, pull it to one side, revealing the floor of the compartment. As he had hoped, it was not a metal plate. His own chamber, the one for the instruments, was not a section in itself but only part of a section paneled off by braced plasterboard. And what was more there were already holes drilled through it so that the air in both sections would be equalized.
This answered another question Robin had been trying to avoid. How was it the air was remaining fresh now, though it had gone stale while he was hiding? Apparently there was a small supply of oxygen operating automatically in the animal section that seeped through into the upper compartment too. Evidently once the rocket went into flight this started to work and would continue for the originally calculated period.
Robin dug his fingers into the openings and pulled. Gradually the plasterboard bent away and opened a space into the section below. He looked down, using his flashlight.
There were two cages below, well padded. In one, two little brown monkeys clung together floating just above the floor and looking terrified. They chattered when they saw him, but remained tightly locked in each other's arms. In the other, four small rabbits were placidly nibbling bits of lettuce, although one rabbit was upside down, another sideways on the side of the cage.
There were a couple of small boxes set in each cage, and Robin could see that they dispensed food and water to the animals at presumably regular intervals. Robin reached down next to the monkeys' cage and started to work loose the small water holder there. He found it slid out of place once he turned the holding bolt. As he drew the little flask upward, one of the monkeys made an effort to nip his finger, but he withdrew it in time.
The water flask drawn up into Robin's compartment made him feel better. This would make his stay a little more comfortable for a while. He felt sorry for the monkeys, who might go thirsty now, but he had a suspicion that the two little beasts were probably too hysterically frightened to eat or drink anyway. Robin wet his throat a little.
He looked back down, reached out, and investigated the food compartment. Sure enough, there were several bananas in the monkeys' food container. They would do also.
He glanced around the space below again. There were the oxygen tanks, set up with a timer, one gently hissing away. There also was a small heating unit with a thermostat that evidently kept the temperature in the animal division at a level—and almost certainly was doing the same for the whole section.
Robin grimaced to himself as he worked the padding back into place on the floor. He might manage to be quite comfortable for a while longer—a day or so more. While there's life, there's hope, he said to himself. Better check the parachute question, too, while I'm at it.
He reversed himself in a neatly executed weightless somersault and making what had once been his roof the floor, worked the padding out there. But here he was thwarted, for he found the rounded metal side of the section's nose. If there were a parachute, it obviously occupied its own compartment at the very tip of the rocket's nose.
He looked out the peephole from his upside-down perch, stared musingly at the panoply of the stars. He wondered if he could recognize a planet should one swing across his narrow field of vision, decided that perhaps he might not be able to do so, so vast were the number of stars present. He looked again at Earth, noticing that it had visibly rotated on its axis. That meant that time had passed, a good deal of it. Mentally he tried to calculate just how much. He was looking at the Eastern Hemisphere now, or a corner of it. At least half a day, or maybe a day and a half, or more. How could he tell how long he had been asleep, how long unconscious?
He realized that he was tired, that his body still ached from the painful take-off. He closed his eyes, and without actually wanting to, fell asleep.
His sleeping body swung slowly to and fro in the tiny space, bumping gently from one side to the other. As he slept he dreamed of falling, dreamed of falling over huge endless cliffs, of dropping down strange chasms, of being carried by huge birds and suddenly being dropped.
His subconscious mind would never give up the insistent awareness that his body was falling. It was a certain thing that such would be the dreams of anyone in space flight. The built-in machinery of self-protection identifies a sense of loss of weight with the automatic warning of a fall. Ten thousand thousand generations of climb from primeval arboreal ancestry found the warning valid—no conscious knowledge otherwise would ever shut off this instinctive alarm.
He awoke again with a start and a convulsive grasp for a tree branch. But he shook off the sensation and rubbed his eyes. He took another sip from the water flask, reached into the compartment below and took one of the bananas. The monkeys were still in each other's arms, but now asleep. The rabbits were nosing the corners of their cage as if everything were perfectly normal.
He looked through his peephole and saw the Moon.
It was large, it was vast, it took up most of the view in his range. It looked as close as the Earth had looked before. He looked upon the stupendous moonscape with awe. It was the vision one strains to see through a telescope. He had often paid a dime to look at it through the six-inch telescope at the City Science Museum. This was the same vision, but bigger and clearer, so very, very clear.
He could see only a small section of the Moon, but that was impressive. A particularly rugged area of jagged mountains, huge craters, high walled and wide bottomed, with long rills and ridges running across the surfaces.
It shone white under the sun, with immensely black shadows breaking it where the sun failed to penetrate. Yet there were more than whites and grays and blacks here. He saw that without the atmosphere of Earth there were other more delicate shadings. The sides of some mountains had bluish and greenish tinges, and more than one crater bottom showed a distinct faint tinge of pale green, or in other spots yellowish blotches. And in one small spot he distinctly saw a mistiness of the surface, saw that a faint fuzziness barred the clear sight of the crater bottom.
He stared with wonder at the sight and the Moon slowly turned out of his vision as the rocket turned. He looked away, deep in thought.
He had read enough about the Moon in his astronomical readings. He knew the various theories, the latest conjectures. He knew that mistiness, that evidences of clouding had been seen often by astronomers, but the sight was nevertheless rare. No two astronomers ever happened to be looking at the same place at the same time. It was always one man's word, and it was never possible to predict such a thing, nor to photograph it.
He knew that those men who made a special study of the Moon recognized these things and had come to accept them as evidence that what was once regarded as a dead world was not entirely dead. They had charted these color shifts in certain spots, one or two areas could be predicted well enough to occasionally be provable to others. Pickering had seen many such color changes, had even attributed it to some sort of fast-growing vegetation.
Robin remembered that it was now largely believed that the Moon had not quite ceased its volcanic internal action. He recalled that astronomers had begun to admit that the evidence of these bits of mist and the further evidence of actual mapped changes in the Lunar topography had proved that something was still warm and boiling within the crust of Old Luna.
Then it occurred to Robin that if the Moon were that close to him, he might really be falling upon it!
He peered out, saw again a section of Luna in view. It was close. Evidently the nose of the rocket had indeed been propelled far beyond Earth's atmosphere, beyond its gravitational grip. If the Moon had been elsewhere, perhaps the rocket nose would have swung about and eventually returned to fall upon the Earth, as Robin had originally surmised. But by chance his orbit, that of the rocket nose in free space, had cut too close to the body of the Moon. The rocket was dangerously near to being seized in the grip of the Moon's gravity and pulled down to it.
Robin mulled this thought over and realized that it was possibly the truth. He glued his eye to the peephole and tried to determine where he was.
After a while, he saw that the Moon was gradually increasing in size. The rocket nose was definitely approaching the Lunar sphere. Because the Earth no longer swung into view, Robin also realized that the rocket nose must have reversed itself, must be heading moonward, must be falling to the Moon!
It would fall faster and faster now, as its trip through space was ending. It was held in the grip of a new world and would speed to its final destruction like a meteoric bullet. It would be another meteor blasting into the surface to flash instantly into powder!
Now that Robin recognized the certainty that he would never return, that he was a doomed man, a curious sort of change came over him. Up to this time, he had been carefully suppressing his inner thoughts, comforting himself with the hope that the trip would somehow end up safely. Yet while his mind was dwelling on that thought to the exclusion of others, his nerves had been under tension. He had felt himself continually on the edge of breakdown, in proximity to screaming.
But Robin had been trained well. His life had never been a particularly easy one and the crying had almost certainly got out of his system during the days when as a little boy he had wandered through a war-torn land hungry and homeless. Life in an orphanage, at best, lacks much of the careful comforts of parents' hands, and those who had come out of such upbringing learn strong self-control early, learn to hold their jumping nerves in check at moments of tension and crisis.
Now that the conscious realization that a crash into the Moon was inevitable had forced itself into acceptance, Robin felt a slipping away of this tension. The die had been cast, the doubt had been removed. He actually felt an easing of his mind, felt himself able to take cooler estimate of his situation.
He curled himself up in his narrow, closetlike space as comfortably as possible and thought the matter over. He was hungry again and still thirsty and this time he ate the second candy bar without saving any. At the rate of speed he was traveling, it could not be many hours more before he flashed to a sudden, fiery, meteoric death. He turned that thought over in his mind, while he drank some more water.
A meteoric end, he thought, to flash like a blazing firebolt, to crash with the violence of an explosion against the dry, dusty surface of the Moon. It might have been spectacular to observe, but he would never know. He wondered if it would be seen from the Earth.
Suddenly, like an automatic switch being thrown on an electronic relay, a memory shot into his thoughts. He was well-read in astronomy, particularly on the subject of the Moon, and the thought that struck him was this:Astronomers did not see meteors crash into the Moon!They just didn't! And Moon observation under powerful telescopes was most exact; if even fair-sized meteors hit the Moon with the same explosive impact that they hit Earth, they would be seen beyond question. Further, since the Moon was a companion of the Earth, and our home planet was bombarded with countless meteors daily, the Moon must be a target of a like number. Of course, the meteors that hit Earth were almost entirely burned up by atmospheric friction long before reaching the surface.
But the Moon apparently had no atmosphere ... there should have been nothing to prevent them from constantly battering the face of the Moon in a continuous, heavy rain of iron and rock. Lunar meteors should be visible all the time. But they were not!
So ... what would really happen when his rocket hit the Moon?
Robin was tingling with strange excitement. Facing death as he was, he knew that even at the moment of dying he would be rewarded with at least one secret of the universe now unknown to men. What was the secret? He wracked his brain trying to bring back to memory all that he had read on that problem.
And he brought back the memory that during the past few years a growing number of astronomers had begun to believe that the Moon was not entirely without an atmosphere. It wasn't believed to have much of one, but it had been pointed out that most meteors to hit Earth burn up at least thirty miles high. And the atmosphere at that height on Earth was very, very thin. So thin indeed that if the Moon had a belt of air only that dense, it might not be particularly detectable from Earth, might not make much difference from the surface—it was almost a vacuum so far as living matter would be concerned—but it would suffice to burn up meteors!
So it seemed likely that his rocket nose would be heated to incandescence by the tenuous Lunar atmosphere and burn to ash long before it touched the surface.... It wasn't a comforting thought—he rather preferred the original conception of crashing.
Robin smiled grimly to himself. A dismal prospect, indeed. He had somehow cherished the hope that at least some wreckage of his rocket would be scattered about the surface, to be discovered some day by the explorers of the future, perhaps hundreds of years later. They would speculate upon it, perhaps trace it and in that way know that one Robin Carew had, in death, been the first to reach the Moon.
But to burn up on high, even that faint honor would be denied him!
He looked again through the peephole. The Moon was close now, very close. He looked down upon a heaving and fearful view—a vast sea of glistening white, with streaks and patches of gray, and here and there great gaping clefts of black. Huge ringed craters, their saw-toothed mountain walls soaring into the sky—and craters upon craters, big ones and little ones, broken ones, craters breaking into the boundaries of others, little ones dotting the bottom of big ones, cracks and clefts shooting from their bases; a ring of jagged mountains running across the moonscape; areas of apparently flat plains.
The sun was directly overhead, for it was still full moon and the glare was great, the shadows that mark the setting or rising of a Lunar day not too obvious, stunted patches of jet blackness. But the Moon was not entirely whites and grays, for indeed it was gently tinted in spots with other colorations. He could see for himself that there were greenish tints in some flat spots, yellowish and purpling areas. And yes, there was even in one tiny patch in a crater floor a faint cloudy mass, a mere haziness that indicated some sort of gaseous mist.
Robin drank in the scene, the view of another world, that world which has dazzled the dreamers of Earth for thousands of years. These might be his last moments, but he could not be denied the saturation of his senses.
The rocket was fast heading down toward a point near the center. The Moon was spreading out, filling the view, and the rocket's slow rotation no longer brought anything into view but moonscape, a constant shifting view, with wonders upon wonders moving into his eye's scope.
Robin drew back a moment, rubbed his arms, scratched his legs. He felt himself tingling, wondered if it were his nerves. He felt itchy, hoped his nerves would not give way. He thought to himself, I may have only minutes now. I shall watch till the end. Then he heard a faint, faint noise.
From somewhere there was a humming. The merest shadow of a hum, and Robin listened to it, startled. The humming rose in pitch, it was no dream, and as he sat, mouth open, amazed, there was a thin, high-pitched screaming outside the rocket and he suddenly began to feel hot.
Robin had but a second in which to think to himself, There's an atmosphere and we're burning up, when there came a new sound. A sort ofbloopfrom over his head, a snapping noise, and something seemed to grab the rocket and jerk it upside down violently.
Robin was tossed in a sharp somersault, banging against the original floor of his compartment in a jumble of arms and legs. He sat up and realized that he was sitting—not floating—but actually sittingagainst gravity's pull! He scrambled onto his knees, peeped through his peephole.
The sky was back in view, the Moon was below the falling ship and he could see the edge of a huge, circular orange mass above him, straining and pulling. It was the parachute from the nose of the rocket. It was the orange parachute designed to land the instrument nose and the test animals safely in the New Mexico desert. And it had been set to open automatically upon the pressure of air when falling.
There was an atmosphere around the Moon then ... a thin, thin one, but the delicate detonator of the chute had functioned. The great hemispheric mass of delicate nylon had opened, had found a purchase, and was dragging the rocket back from a disastrous burn-out.
Robin breathed a sigh of relief, strained his eyes to see the moonscape again. The rocket was still falling, mighty fast it seemed. He could see the moonscape rise out, expand to fill the view. The rocket was warm now, definitely still heating from the thin friction. It vibrated and whistled but it swung in no breeze. It was moving too fast. In that almost unnoticeable belt of tenuous air there would be no winds that could deflect it. The parachute was open, but the air was not thick enough to do more than slow it down too gradually for it to be saved.
It would, he realized, still crash into the surface with a deadly force. It would hit like a shell from a cannon, and the explorers of the far future would have their mysterious fragments of tooled metal to speculate on.
Below him Robin saw the jagged mountain peaks reaching up for him into the dark black sky. He scanned it, remembering his Moon books, remembering the cold photos taken by distant Terrestrial cameras and the careful diagrams and names given by men long dead. He was hitting near the center of the Moon, a little above it, and the crater whose walls were reaching up ... why he could even name it. He grinned wryly. It would be Theophilus, and it seemed he would miss it, hit somewhere near it in a bay of the so-called Sea of Tranquillity.
Rushing up toward him, Theophilus was no peaceful Greek ancient. It was a barren, toothed, rocky edge, miles up, without the snow that makes our mountains majestic, without a trace of the forests that conceal a mountain's jagged sides, without even the gentle weathering of rain and water.
And the Sea of Tranquillity—a dark, wrinkled plain that looked as if it had gone through the agonies of torture ages past. The marks of almost-vanished volcanoes on it, pale circular rings like pocks of burst bubbles, rambling ridges, and ugly cracks, and here and there domes rising gray out of the surface, like the tops of giant bubbles working their way out of the dry and flaky crust.
Robin watched in dread fascination. He heard the whistling and shrieking of the rocket like a demon in torment. He himself was burning and itching as he was being baked, although he felt no fever. The rocket was warm but getting no warmer. The topmost peak of Theophilus was rushing up into his sky like a fast-growing stone geyser.
He watched it shoot up, saw it grow, saw the ground become clearer and clearer, each ghastly detail spreading out, assuming three-dimension reality. Now the peak was on a level with his eyes, now it was beyond him, and he was in the last few seconds of his fall.
The rocket seemed to be slowing slightly. The atmosphere was possibly getting a trifle thicker at the surface, enough to prolong the agony a minute or two or three longer. Above him the parachute strained and twisted. But still the rocket was falling too fast. It rushed down, straining to complete its act of affinity with a new gravity, as if tired of its brief period of interplanetary freedom, and anxious to pledge allegiance to a new gravitational master.
Below, the moonscape was coming up fast. Robin could see well enough to begin to speculate where exactly he would hit. There was a small circle that must have been a crater scar. There were several dark lines that might be a network of cracks. And there was a dome.
He remembered those domes. They had been quite a recent discovery too. Not easily seen until latter-day instruments showed the surface of the Moon dotted with these odd bumps. Their nature was still a mystery.
It looked as if Robin would find out the hard way what their construction was. For now he was clearly heading directly for the center of the one below him. A bubble-top pushing out from the plain, hard and shiny like lava, glistening in the sun against the gray and dusty surface of the plain around it.
Theophilus's wall was already on the horizon, high and towering. And now Robin realized how terribly fast the rocket was still falling. The mountain was a measuring stick and it was fearful.
There was a moment of dreadful suspense as the rocket raced to a bull's eye on the upthrust center of the dome. The rounded surface rushed up.
Robin flattened himself against the padding, clutched his head in his hands, and stiffened himself. The rocket hummed against the thin air, it vibrated against the parachute, there was a terrible split second of shock when the bullet-shaped structure of the rocket's cargo nose made its contact with its Lunar target, and then a clap of sound in Robin's ear like a blockbuster going off.
Robin had no time to wonder why he had not been instantly killed by the crash, because the explosion on hitting the surface of the dome was followed instantly by a tremendous roaring sound that surrounded the entire rocket nose. This was in turn accompanied by a powerful pressure on the rocket, which threw Robin against the nose-end cushioning and held him there.
The pressure was not steady, changing as the roaring itself changed, with sudden bursts of sound, convulsive shoves, and changes in pitch. The rocket was being slowed by a terrific outward burst of gases, gases that must have been imprisoned in a huge volcanic bubble whose outermost surface was the dome, so mysterious to Terrestrial observers. By bursting through the thin lava shell, Robin's rocket had released these pent-up gases and was boring its way down on its still rapid momentum against the pressure of this column of gas.
Robin did not know this at the time, though he figured it out later. At the time, he had all he could do to keep himself from being battered black-and-blue by the jolting rocket. He kept his head clutched tightly in his arms, rode with the bumps and roars, and tried to keep his breath from being knocked out of his lungs.
There was another violent shock and crack and again the rocket bounced to a new flow of gases. It had slammed through one huge bubble, breaking through the bottom shell only to burst into a lower pocket of gas. The roaring subsided to a lower pitch as the new gases did not find the near-vacuum of the surface that the first gas bubble had opened upon. The rocket fell steadily, bursting through a third, and then a fourth such bubble. It was clear that the surface of the Moon, at least in that area, was a mass of congealed gas pockets, a honeycomb of thin-walled lava bubbles, perhaps quite deep.
The rocket was almost entirely devoid of its original space momentum by the time it hit the bottom of the last bubble, snapped the thin crust, and fell through it. This time there was a sudden hissing around the battered nose and a warmth began to flow through the body of the rocket. It was enveloped in a belt of hot steam through which it fell several hundred feet and then hit something with a loud splashing noise. The sound vanished as the rocket sank deep into the new substance, came to a halt, and bobbed back upward.
Robin had gotten hold of himself after the third bubble and was hanging on, mentally trying to estimate what had happened. This last sound had been familiar. It must have been water, and the bobbing back of the rocket to the surface confirmed his views. He felt the rocket bounce a couple of times and then subside to a gentle rocking and rolling.
Robin held on for a moment, getting his balance. In some ways the new motion was more disturbing than all that had gone before—the cylindrical body of the rocket, with its blunt end and its rounded nose, was twisting and turning as only can be done by a bottle tossed in a flowing stream. Robin tried to get hold of himself, orient himself to the odd seasick motion, then managed to work his way to the peephole.
He could see nothing. Whatever was outside was without light. But it sounded like water lapping against the sides, it felt like water's forces, and the rocket seemed definitely to be afloat. Robin used his flashlight, tried to direct its beam through the tiny camera outlet. After a little manipulation he succeeded in getting some reflection from outside.
It was water, and the rocket seemed to be floating rapidly along on some sort of dark subterraneous tide. Robin sat back, puzzled. Water—under the Moon?
He held on, still feeling a little dizzy, feeling dirty and itchy, but suddenly beneath it all a little thrilled and pleased. He had survived the crash by some miracle—he was on the Moon and alive! What next?
Next was quick to come. There was a sudden dip in the current and the rocket tilted forward as it shot down a spillway, down a violent decline on a raging torrent, sliding down an unseen waterfall for a surprisingly long time, leveling out at a fast clip, sliding down new tunnels through which the water raced, hitting the side of sharp turns with occasional glancing blows, down more dips and falls, spinning violently around in unseen whirlpools, and finally racing out on a fast stream to gradually slow down and finally come to rest, gently bobbing.
Robin had been knocked around during this breathless ride and only gradually did he realize it was over. Warily he raised his head from where he was sprawled in his tiny closet-compartment and waited. But the gentle bobbing continued.
He put his eye to the peephole and looked. There was a glow outside, a grayish, pale glow, but he could see that the nose of the rocket was somehow grounded on something dry while the tail was still in the water rocking to the current.
He considered his next course of action for a few seconds. It seemed as if he had a chance to escape from his vehicle at last. But escape to what?
Was there air outside, wherever it was that he found himself? If there were air, was it enough to sustain him? Might it not be poisonous or utterly lacking in oxygen?
Well, Robin thought to himself, there isn't really any choice. If I stay here, I'll starve to death or suffocate. If I go out, I may die even sooner. But now or later, if it has to be, it won't make any difference. Whatever the odds in favor of my being able to breathe here, I've got to take them.
He twisted around, found the circular port through which he had originally entered the rocket. He worked at it with his fingers, realizing that it might be quite difficult to open. He worked away the padding that lined the interior, found that it had an arrangement that had automatically sealed it when closed. There was no handle on the inside, for it had never been planned to be opened from that side. However, there were several screws over a small plate, and Robin set to work to unscrew them. He had a Boy Scout knife in his pants pocket—the kind with several blades—and with the back of the biggest blade he worked out the screws.
The panel off, he saw how the sealed gimbals worked, clicked them open and pushed open the door. It held tight for a moment, then popped open. There was a sudden drop in the pressure, Robin's ears popped, and he gasped for breath.
The air outside was lower in pressure than that inside the cargo nose of the rocket, which had been sealed at Earth level. But it was air and it was breathable. Robin drew in several deep lungfuls, savoring it.
It was oddly exhilarating, as if highly charged with oxygen. At the same time there was a smell of mold and dampness and a definite taste of sulfur and phosphorus like that just after a kitchen match has been lighted. Even so, the air was breathable.
Robin worked his head and shoulders through the narrow opening, slid forward and landed on hands and knees on the rocky surface. He got to his feet, looked around.
He was standing on the bank of a rushing stream of water, which was pouring out of a large gap in the side of a cliff. The cliff ran straight up, gently curving to form part of the ceiling several hundred feet overhead. The extent of this ceiling was impossible to determine—it was dark and obscure—but it seemed to Robin almost at once that he was in some sort of gigantic enclosed space—a vast cavern beneath the surface of the Moon, probably several miles beneath it.
The water coming from the underground falls rushed out to form a wide, shallow river which flowed along one side of the cavern and widened out to a few hundred feet clear across to the farther wall. On Robin's side the floor of the cavern rose in a slow slope until it reached its wall perhaps three hundred feet away. Robin could not estimate the length of the cavern. Looking along the river bank, the cave seemed to become veiled in a general mistiness and gathering darkness.
The light itself came from no definite source, but seemed to emanate from the rocky walls and ceiling, from the clayey ground, and from the general atmosphere. Robin supposed that the source was a natural phosphorescence which he knew was not too uncommon even in Terrestrial caverns.
All around on the soil bordering the flowing water was a forest, a forest with the weirdest vegetation Robin had ever seen. Plants growing in clumps and clusters, plants whose large treelike stalks resembled a whitish-blue bamboo, and which burst into globular blue bulbs which seemed to serve as leaves. Among these tree-sized growths was a rich undergrowth of tight balls of varying yellow and green and purple, growing like thick, squat mushrooms. And everywhere else a thick, lush carpet of green, not grasslike but rather like some oversize moss.
In this forest there were no sounds of birds or animals, but only that of plants swaying in the river breeze, the rushing of the waters, and from somewhere distant in the unseen end of the cavern a strange, steady hissing sound.
The rocket, or what was left of it, lay wedged against a section of the bank, its nose up and its tail swaying in the current. Robin looked at it, amazed to find it so small. All that was left of the rocket was the cargo nose, which was the only part sent off after the last of the rocket sections had discharged their forces and been dropped off. The whole affair was not more than about ten feet long, from the battered, blunted red nose, from which several long, straggling orange cords hung—all that was left of the parachute and its attachments—down to the scraped and battered white cylinder that was the cargo compartment. The compartment ended in a flat plate which bore only a few wires that had once connected it with the break-away mechanism of the last of the atomic blasting chambers. This alone was the load of the eight-story tower of energy which had been the Red Sands experimental rocket.
Robin, without further delay, bent down to the cylinder and began to haul and push it entirely out of the water to the dry ground. He knew he could not afford to risk its loss. To his surprise, moving the rocket head was an easy task. It was extremely light and he found himself possessed of tremendous strength, tired and bruised and sore as he was.
It was, he thought, as he pulled the rocket along, the Moon and its weak gravity. He would only weigh a sixth of his Earth weight here, so would the cargo head, yet he would have the muscles necessary for much more than that weight. He would literally be a superman here—if he could survive.
Survival, he knew, would be the question. He didn't know whether even now he might be inhaling poison from the strange, thin sublunar air. He didn't know what mysterious radioactive rays might be bathing him with their baleful influence. He didn't know whether any of the vegetation in this cavern world would be edible.
Having brought the cargo cylinder to a safe spot many feet from the water, Robin looked for the door that would open the animal compartment. He found it, forced it open. Inside were the two cages. Gently he reached in, unscrewed them from their holdings, and lifted them out.
One of the monkeys was dead, probably killed by some of the jouncing the rocket had taken. The other, looking miserable, was clinging to the bars chattering. Robin looked at it, and the monkey looked back. The young man unlatched the cage, reached in, and took the little brown animal by the back of the neck. But the monkey made no effort to bite. Instead, it twisted around, grabbed Robin's arm, and hung tight.
When his grip was released, the monkey scurried up Robin's arm and clung to his shoulder, recognizing the need for companionship after its frightening experiences.
The rabbits had fared slightly better. One of them was dead, but the other three, while somewhat beaten around, were alive and sniffling their pink noses. Robin saw that there was very little food or water left for the animals.
Here then was the means to test the Moon's capacity to produce food and drink. First, however, Robin decided he would build a pen for the rabbits. If he were lucky, he could breed them and have at least one source of food suited to his system.
He went over to the nearest clump of ball-trees, looked them over, tested his strength on them. They broke easily and quickly when he grasped one by the trunk and pulled. He found that it could be splintered into shreds fairly rapidly and that inside the shell of the stalk was a mass of cottony matter.
He shredded a number of the stalks, and then staked them out in the ground to make a small fenced pen, tying the whole together with one of the long cords hanging from the parachute nose. Into this makeshift pen, he released the three rabbits. He filled the cup from their cage with water from the river, placed it in the pen. The rabbits hopped over, sniffed, and drank. They seemed to suffer no ill effects.
Robin broke open one of the ball-like growths from the tree, found it contained a substance resembling a combination of melon and potato. He offered some of this to the rabbits and after an interval they ate it and seemed to like it.
The monkey was chattering away as Robin did this and suddenly scampered down and snatched a piece of the ball-food, stuffing it into its mouth. Robin had not wanted to use the little creature for a test but the damage was done. However, the monkey seemed to enjoy it.
Robin sat down on the ground and watched. He felt tired, now realized just how tired he was, how sorely he ached from his experience. He felt warm and headachy now that the strain was over. He knew he still had things to do. He wanted to try to make a fire and cook the rabbit that had been killed. He was thirsty as well. He wanted to tie a cord to the monkey so that the animal would not run away into the unknown and possibly dangerous regions of the cavern. He wanted to find a safe place to sleep and hide should there be some sort of animal life around.
But he was growing terribly sleepy and feeling quite sick. He curled up, and before he could stop himself, he was asleep.
The rabbits nibbled on. The monkey sat on a ball in one of the strange trees and watched in silence. Far off, somewhere in the cavern, the mysterious hissing continued.
When Robin Carew opened his eyes, he knew he was a very sick man. He felt warm, sticky, and he hurt all over. He tried to sit up, but everything spun dizzily around him. His arms, legs, and body were burning intolerably and there was an itch throughout him that he could do nothing about. He lay back, trying to gain strength.
A little later he managed to crawl to the water's edge, fill the container he had used in the trip from Earth, drag himself back. For a period whose length he could not determine he lay helpless in fever and pain, arousing himself only long enough to drink to soothe his tortured body.
Finally, the fever broke. He sat up, feeling weak but with his mind clear at long last. He dragged himself to his feet, blessing the light gravity, aware that if he were back home his body would not have responded. He felt that he was gaunt, he knew he had been through a terrible siege, and he could only guess at the time he had lain there, tossing about on the strange Lunar ground, unprotected in the queer climate of this unknown cavern. It must, he felt, have been days—Earth days, of course—that his attack had lasted.
Later on he decided that he had suffered from a severe case of space burn. Having traveled through the emptiness of the void between the planets, the vessel had been nearly unprotected from the cosmic rays and the more penetrating of the sun's invisible rays. He considered himself lucky to have survived at all.
He desperately needed food now to rebuild his body. He looked at the rabbit pen. The little animals were there and evidently prospering on the ball-food he had prepared for them before his sickness. It was almost all gone and he broke open and pared more at once. He wondered how long it would be before the animals bred—he knew that rabbits bred fast and abundantly, and hoped it would hold true on the Moon.
There was a sudden chattering in one of the strange trees and he looked up to see a little brown face peering at him. In a moment, the monkey leaped to the ground, then leaped in one tremendous jump to Robin's shoulder and perched there happy at finding companionship again. The monkey looked none the worse for its experience and evidently was getting along nicely on the Lunar vegetation. Thus encouraged, Robin fed himself, first carefully testing everything on the monkey, who objected to nothing.
But somehow the food was not entirely satisfying to the man, who felt that he needed more than that to recover his full energy. He looked again at the rabbits, looked also for the carcass of the dead one. But he found that part of it had rotted and part had been consumed. He looked closely and saw his first glimpse of a Lunar counterpart to animal life.
There were many tiny creatures, a half inch to an inch in length, looking at first like ants but on closer inspection appearing more like three-segmented worms, for they lacked legs and moved in an inchworm's fashion. Instead of antennae, each little worm-ant had on its front segment a single upstanding stalk ending in a little yellow ball. Robin touched one of these and it glowed momentarily. An organ of light, he thought, something like the ones carried by deep-sea fishes. The tiny things were eating the dead rabbit.
Robbin went back and examined the three remaining rabbits. Two were males and the female was evidently heavy with young. Well, he could afford to dispense with one of the males, then, for he knew his body needed meat.
He put the rabbit back though, realizing that first he must make a fire and determine how to cook his meal. He searched his pockets. He was wearing the GI jacket he'd taken from the soldier in Las Cruces. As he had hoped, he dug up a pack of matches in one pocket. He turned it over in thought. When this pack was used up, how could he make fire?
He piled some trunks of dead tree stalks in a cleared spot; he lit them with one of his matches. They caught fire rapidly and soon he had a nice blaze going. He watched the smoke rise and saw that it drifted rapidly away in the same direction the current was flowing—evidence of more caverns somewhere beyond.
He opened his scout knife, hesitated. He'd never cooked a rabbit before. In fact, he'd never had occasion to cook anything for himself. It was meat, he thought, and even if it were eaten raw—well, savages did, so he, too, could manage. He thought about boiling it in water, then realized that the light air pressure might allow water to boil without getting the necessary cooking effects. The best method therefore was to fry it where he could observe the progress.
Steeling himself, he seized the rabbit, killed and skinned it, the latter a process which he found thoroughly unpleasant. Cleaning it of its entrails, another unpleasant task, he cut the meat up into sizable chunks, skewered a couple of pieces on a metal rod which had been part of one of the cages from the rocket, and sat down to cook it over the open fire.
It turned out to be a longer job than he'd thought, and he burned the meat quite thoroughly in the process, but finally he made it edible and chewed it slowly. He needed salt, he realized, and wondered if he could find any. This would have priority when he began his explorations.
He hung the balance of the meat on a ball-tree with a piece of cord. He had seen no evidence of flying insects or creatures, and hoped thereby to be able to preserve the rest of the meat.
Thus fed, he sat down and began to map out his course. I must do things systematically, he told himself. I must keep track of time, set up a regular pattern of living, find a permanent base of operations. I shall have to explore this cavern and those beyond it, find all possible enemies and invent ways and means of defending myself. I shall have to breed my rabbits in quantity, find a way of using their pelts and fur. I shall have to determine a use for everything left from the rocket's material—metals and the like.
For, he continued telling himself, my one aim shall be to stay alive long enough to be found some day by exploring rockets from Earth. I am a Robinson Crusoe of a new world. Crusoe waited twenty-eight years for rescue, I must be as courageous. In his case, he had no evidence that any ship would ever bother to call on him. In my case I know that rockets are being made that will eventually lead to further Moon trips. I know that men are planning to come here. I must wait it out, even for twenty-eight years.
But it was not that simple and he knew it. But first things first, and the first task was to survive.
With the monkey scampering on ahead, he set out to walk to the cavern wall. He found it to be dark and glistening, a lavalike sheet resembling the bubble it was. Leaning against it and looking upward, he saw that it curved gradually up, and that indeed he was in a flaw within a very porous world. Like the inside of a Clark candy bar, he thought, with a wry smile.
Astronomers on Earth had always been puzzled by the lightness of the Moon. They had speculated on it as being mainly pumice. Lately there had been much speculation and opinion holding forth the theory that the Moon was porous, had these bubbles and air pockets all through it, that the Moon's water and atmosphere had all gone underground to be sealed off in these hollow spaces. He now knew they were right.
Most of these Moon bubbles, large enough to hold cities, must be entirely sealed off. But others were linked, sometimes broken into by quakes or the volcanic action which was still going on in the depths of what had once been considered a dead world. This particular cavern was such a bubble.
Robin walked along the outer wall and saw a dark black spot in it, and then others. He came to them, found they were breaks in the surface, pocks caused by smaller bubbles. He looked into one that opened at the base. Using his flashlight, he could see that it was a small, almost entirely spherical cave. He found others pocking the walls of the cavern bubble.
This then was the ideal spot for a permanent home. Not that he needed shielding from the elements, for obviously there were no elements here—no rain, snow, clouds, or weather oddities. Neither was there night or day.
Robin would move his possessions into this cave, simply to have them located and safe. Besides, there might be some larger form of life, some carnivores around—he could not tell. Better to be safe than sorry, he said to himself.
He acted at once, carrying the rocket nose and its stuff to the cave, transferring his rabbits and their pen to a spot just outside the cave door. He would need a bowl for water and, using his screwdriver blade, he finally managed to detach the curved rocket nose and found himself in possession of a deep bowl. He took this down to the water, filled it and carried it back to his cave.
Already he began to feel cheerier. Nothing like work, he thought, to take your mind off your other problems. Suddenly he realized he was tired.
How long had he been at this? He did not know. Now he realized that with no sunrise or sunset visible in his underground world, he could not tell time. He looked at his wrist watch, but it had stopped running, of course. He decided to take a nap; he lay down and fell asleep.
When he woke up, he set his watch at eight o'clock, decided to consider this the beginning of a day. He found the notebook he'd carried in his back pocket, opened it, and set up his new calendar. Using the date of the rocket's take-off, he allowed five days as a probable estimate of the time passed since. He had no means of knowing how long he had been ill, he suspected it had been longer, but decided to let it stand. After arriving at the date, he made the time eight in the morning, laid out the times he expected to eat, to work, to sleep. He would try to live according to a full Terrestrial day, checking the passage of time by his watch.
He then listed all the things he expected would have to be done, and decided to check them off as he completed them. Next he ate breakfast from the fruit of the ball-tree. He spent the rest of that morning trying to find a means of making fire. He had some bits of steel from the rocket, and he tried to strike sparks on everything that resembled rock. After a search, he found some fragments of rock near the water that gave off a spark. Whether these were flints or not, he did not care, so long as they worked for him.
With this discovery he knew he would be free from worry about the problem of matches. His next problem was to secure a weapon. This solved itself rather fast with a bow and arrow. A long, flexible metal tube from the rear connections of the rocket, bent to make a bow when tied with a string of nylon cord, made a satisfactorytwangwhen pulled. He made arrows out of the fibers of the Moontree stalks, and practiced shooting.
The next few days followed the same pattern. Robin enlarged his area of exploration, finding several other kinds of Lunar vegetation and a number of other insect-worms. He found several that were quite large, one as large as a squirrel. It was an odd thing, humping itself along in little bounds—a creature of a dozen ball-like segments, two of which had toothed mouths, although only the ball in front had an eye, a lidless orb set in the center of this ball. But the creature was fringed with the light-rod organs as the tiny worm-ants had been.
Robin tried to cook part of this creature but the monkey refused to touch it and he found it entirely unpalatable. On the other hand, he found that when he removed the little yellow balls from the top of the light stalks on the creature, they remained glowing—even as do the abdomens of fireflies. He therefore diligently set about catching a number of these Moonrats, as he named them, and making a lantern for himself by filling a glass tube with the glow organs. This worked out quite nicely when he experimented in his dark cave-home, emitting a clear, though pale, yellow light.
His rabbit had a nice litter at last, and Robin carefully saw that they were kept well supplied with food and drink. He would eat no more meat until there were several dozen adults, all breeding. But he felt that now he was assured of a source of clothing when his own would give out. He knew that eventually he would have to dress himself entirely in the products of his own ingenuity. His Earth clothes could last no more than a few years. He had already devised for himself an experimental pair of sandals from the rinds of the ball-tree fruit and the stalks of the Moontrees. They would do, and he carefully removed his shoes and put them away. When he had heavy exploring to do, or if and when he might try to reach the surface, he would need his good heavy leather shoes. Until then, the makeshift sandals would do.
For he knew that someday he would have to reach the surface. If and when the first astronauts arrived, they would not go below. They would probably never suspect the presence of these unseen areas beneath the crust, possibly not for many dozens of years. It would be on the surface that Robin would have to go to find rescue. That was the greatest problem he would have to solve. Against that terrible trip, he would have to conserve and plan.
Meanwhile, he had a toehold on life here, if conditions within his sublunar cavern did not change. But they were changing ... and not for the better.
When he woke up one morning Robin was vaguely aware of something different. He opened his eyes to the dark interior of his cave-home and lay there on his bed of padding from the cargo chamber. For a while he rested quietly in that pleasant half-sleep of awakening after a good rest. Unconsciously his hand moved down searching for a blanket, but of course there was none. He'd never needed one before.
He unconsciously groped again for the blanket, then opened his eyes wide and sat up. There was a slight chill in the air at that! Now he noticed the monkey, asleep, curled up tightly against his leg. That was odd because previously the little fellow had slept outside. What had brought him in?
Robin got up and Cheeky, as Robin had named his friend, woke up instantly and leaped to his shoulder. "What's the trouble, fellow?" asked Robin, patting him on the head. Then the young man left the cave and looked around. At first nothing seemed greatly changed. The temperature had dropped a few degrees, no doubt about it. Yet there was no special draft, no break in the bubble walls to account for it.
He looked at the plants and then realized that some of them were beginning to change color. A grayness was creeping in subtly. The balls of Moontree fruit, which had been his chief sustenance, were showing signs of wrinkling and had either already shriveled or were beginning to.
Robin glanced around sharply, looked into his notebook calendar. He calculated the days that had passed. When his rocket had crashed the Moon had been full. This meant it was high noon of a Lunar day on the surface above. But a Lunar day lasted about a Terrestrial month—twenty-eight days to be exact. When the sun was at its height, the temperature of the surface crust was to be measured as high as 240 degrees Fahrenheit. By sunset it might be down to 160 degrees, but immediately after sunset it would drop with great speed and shortly begin to go as low as a hundred below zero and continue to drop for yet another hundred degrees.
And Robin had perhaps been in his sublunar cavern for ten or maybe twelve days. The sun had set above, the Lunar night was there. Though the cavern was insulated by the best sort of insulation in the universe—a honeycomb of several miles between the surface and itself—a honeycomb in many cases consisting of sealed bubbles, some near vacuums—there was bound to be a gradual loss of the stored-up heat from the long Lunar day. It might take a while for this to become noticeable, especially in view of the obviously warm volcanic action from the unseen areas near the core of the Moon below, yet there it was.
So now Robin knew that the Lunar day did have a counterpart here, that there would be monthly seasons in his cavern and that he was facing a winter that might last ten days more.
He looked around, pondering this. Could he survive? He had probably only a short time to work this out. Obviously he had to work fast and make good.
"Come, Cheeky," he said, "no time for foolishness. No daily swim in the river this morning. Harvest time is here."
He glanced at his rabbits, but they did not seem to mind the temperature drop. He went into the clumps of Moontrees and began to gather their fruit—the big balls—as fast as possible. They were still plump enough to hold food-pulp. He realized that if he waited, they would probably dry up on their trees, shrivel to seed as the increasing cold drew the moisture from them. He spent that day in gathering a harvest, in piling great masses of the fruit in a small cavern-wall bubble near his sleeping chamber. When he had amassed enough to see him through at least two weeks, he gathered the fallen trunks and dried-up old stalks and piled them in the narrow entrance to this storage cave. He built a fire there, paced it out, and spread it out to burn slowly. He would have to keep this fire going and another like it in front of his own sleeping cavern.
He transferred the rabbits to his bubble-home also, rebuilding their pen.
As he had expected, the temperature in his hidden world continued its fall. A few days later it was quite chilly and the Moontrees had acted as he surmised. Their fruits had withered quite rapidly, finally dropping off as small hard seeds. The tree stalks dried out, turned hard, and fell. Robin gathered them as fuel for his fires, found that they were quite excellent, and also that the fresh-fallen ones could be woven into basketry.
The river continued to flow, but was more sluggish, and its waters began to grow cold. On the other hand, the Moonworms and other little creatures seemed to be having their heyday. They were out in quantities greater than he had ever seen and were busily gathering the fallen seeds, carrying them away, evidently preferring them to the fruit.
Robin made himself a jacket from an extra part of the padding, stitching it together with cord and thongs made from shell fibers. With a fire going at the door of his cave, he found he still wouldn't need blankets.
During the balance of the Lunar night Robin was forced to remain close to his caves, tending his fires, conserving all his energies. Outside, the temperature never actually reached freezing, or at least not that Robin could estimate. But at its worst, it was definitely chilly and the river fairly cold.
The view within the cavern cleared somewhat of its usual mugginess and he could see much more. He could now make out the walls on all sides, and discovered that the farthest distance, in the direction in which the river ran, was perhaps several miles off. The vegetation had mainly flattened, was drying up, and he could see everywhere the little ball-segmented insects humping and squirming about.
He saw a number of varieties he had not noticed before. One day venturing out with his bow and arrow, he disturbed something working amid a pile of broken stalks. The thing rushed out, directly at him. It was large, as large as a dog, and it ran straight for him silently, its wide mouth gaping.
He shot it, saw it fall over as it was about to leap at him. When he dug his arrow out, he saw that it was no wormlike insect, no segmented creature. It was a recognizable animal, a creature with two short stubby feet, two small extensions that were like hands on each side of an oval body. A definite head surmounted this, with one eerie eye set in the middle over its wide mouth. Two little breathing holes in the side attested to its possession of lungs. A long, curving rod grew out of the top of its skull and held a large yellow light-ball over it.
There was yet another peculiarity about this Moonhound, as Robin called it. It had no definite color. Its skin was faintly transparent, and he could see its inner organs shadowy within.
All this reminded Robin that there must be vast cavern worlds totally without light, yet having flora and fauna.
When there is no light, there is no need for pigmentation. Hence, this creature had none.
Robin also surmised that it was probably the cold that drove this beast into the lighted cavern in search of food, for he had never seen evidence of anything that large during the warm period.
Robin brought the carcass back to his cave and went to work to skin and cook it. At first he was not going to, for the hairless, colorless nature of it was rather repellent. But one thing Robin had learned long ago was not to let his emotions dictate to his needs. Like it or not, he was going to make use of everything here he could. He had a task, and that was to survive.
As a matter of fact, the meat cooked very nicely, turned brown in the fire, and tasted good. Further, it had a bone structure, which the Moonworms hadn't, and Robin saved these bones, knowing that there were many things that they could be used for. He remembered museum exhibits of bone needles, bone knives, and bone implements, including arrowheads and buttons that the Indians had made use of.
After that, Robin deliberately hunted for these Moonhounds and caught several others before the winter was over.
The warmth returned about when Robin had figured, starting a day or so after the surface sunrise. It rose rapidly, faster than it had fallen, and just as fast, new Moontrees were shooting up, new Moonmushrooms were growing, and the river was becoming warmer.
As time went on and month followed month, Robin found himself working into a comfortable, if primitive, routine. He charted exactly what to do on what days. He could tell in advance what he would be eating, what he would be harvesting. His rabbits had become sufficient in number to permit slaughtering, and he began to acquire a pile of rabbit furs. He found it no longer possible to keep all his rabbits in one pen, and finally liberated the majority of them and left them to shift for themselves. This worked out fine, and he never lacked the sight of at least one or two bunnies anywhere he looked. During the two weeks of winter each month they simply holed up as they might have done on Earth. It was an odd sight seeing the rabbits run wild, for their powerful leg muscles were many times stronger than was required by the weak gravity and, when they ran in a hurry, they would bounce many feet high in fantastic leaps.
Robin was now wearing a rabbit-fur outfit of coat, pants, and hat during the winter periods, equipped with bone buttons he'd carved from the Moonhound skeletons. He was, if anything, beginning to gain weight, but he was also aware of the paleness of his skin. He wondered whether staying in this sunless world a sufficient number of years would not make him as palely transparent as the Moonhounds.
But all this time Robin had not forgotten his ultimate mission—to reach the surface and signal for help. He had worked out the problem in his own mind. He had to make some sort of space suit, something that would permit him to venture out on the nearly airless surface long enough to set up a signal that astronomers might see.
He knew he had the materials for part of this suit in the metal salvaged from the rocket nose. He could polish a section sufficiently to make a heliograph with which he could flash a code message to any high-powered telescope that might be pointed his way. But he had also to fashion the metal into an airtight space helmet, and that he did not know how to do. The suit itself he could probably fashion from cloth and tanned skins, sew and seal it tight enough with animal fats and bone glue to be airtight for a short period, but he needed the helmet. He had the glass for it too, the little peepholes for the camera outlets and a large circular plate that had been set in the very base of the cargo nose and evidently intended for a wide-vision camera shot of the Earth. This plate would be his face plate.
Robin was aware of the hissing noise that he had first noticed on his arrival, but he had never investigated it. It was far off, somewhere along the wall of the cavern. One work period, when he found himself ahead of schedule, he set out to find the source of the noise.
Following the wall, with Cheeky running ahead chattering, the hiss gradually grew in volume. Robin made his way over a sharp cleft, skirted a large bubble-cave in the wall, and after about two miles of walking, came upon the source.
Issuing from a break in the outer cavern wall was a stream of blue flame. For several hundred feet around it no vegetation grew, the ground being covered with thin gray ash. Robin looked at the loudly hissing lance of blue fire.
It probably was a breakthrough from some adjoining bubble, one filled with a gas of some inflammable sort. Somehow in the course of the breakthrough, this leakage had been set aflame. And there it was now, a burning gas jet, sharp and hot.
At that moment, Robin knew he had the answer to his metalworking problem. He'd tried to melt the metal of the rocket over his fires but he had been totally unsuccessful. But this jet, this hot blue flame, this surely would do the trick!
For him the space helmet was now a certainty. It might take time, but now it could be done. That and more was possible, for he had enough metal to make a few necessities like a decent frying pan and a pot to use for boiling and perhaps a water container for a really long exploration trip.
That was the end of Robin's first "Stone Age" period and the beginning of his "Iron Age."