When he found one and realised that he was now about to attempt some real climbing, he hesitated. He remembered that what was above him might be a cliff which even in daylight and properly clothed he would never dare to attempt: but hope whispered that it might equally well be only seven feet high and that a few minutes of coolness might bring him into those gently winding passages up into the heart of the mountain which had, by now, won such a firm place in his imagination. He decided to go on. What worried him was not, in fact, the fear of falling, but the fear of cutting himself off from the water. Starvation he thought he could face: not thirst. But he went on. For some minutes he did things which he had never done on Earth. Doubtless he was in one way helped by the darkness: he had no real sensation of height and no giddiness. On the other hand, to work by touch alone made crazy climbing. Doubtless if anyone had seen him he would have appeared at one moment to take mad risks and at another to indulge in excessive caution. He tried to keep out of his mind the possibility that he might be climbing merely towards a roof.
After about quarter of an hour he found himself on a wide horizontal surface - either a much deeper shelf or the top of the, precipice. He rested here for a while and licked his cuts. Then he got up and felt his way forwards, expecting every moment to meet another rock wall. When, after about thirty paces, he had not done so, he tried shouting and judged from the sound that he was in a fairly open place. Then he continued. The floor was of small pebble and ascended fairly steeply. There were some larger stones but he had learned to curl up his toes as his foot felt for the next place and he seldom stubbed them now. One minor trouble was that even in this perfect blackness he could not help straining his eyes to see. It gave him a headache and created phantom lights and colours.
This slow uphill trek through darkness lasted so long that he began to fear he was going round in a circle, or that he had blundered into some gallery which ran on for ever beneath the surface of the planet. The steady ascent in some degree reassured him. The starvation for light became very painful. He found himself thinking about light as a hungry man thinks about food - picturing April hillsides with milky clouds racing over them in blue skies or quiet circles of lamplight on tables pleasantly littered with books and pipes. By a curious confusion of mind he found it impossible not to imagine that the slope he walked on was not merely dark, but black in its own right, as if with soot. He felt that his feet and hands must be blackened by touching it. Whenever he pictured himself arriving at any light, he also pictured that light revealing a world of soot all around him.
He struck his head sharply against something and sat down half stunned. When he had collected himself he found by groping that the shingle slope had run up into a roof of smooth rock. His heart was very low as he sat there digesting this discovery. The sound of the waves came up faint and melancholy from below and told him that he was now at a great height. At last, though with very little hope, he began walking to his right, keeping contact with the roof by raising his arms. Presently it receded beyond his reach. A long time after that he heard a sound of water. He went on more slowly in great fear of encountering a waterfall. The shingle began to be wet and finally he stood in a little pool. Turning to his left he found, indeed, a waterfall, but it was a tiny stream with no force of water that could endanger him. He knelt in the rippling pool and drank from the fall and put his aching head and weary shoulders under it. Then, greatly refreshed, he tried to work his way up it.
Though the stones were slippery with some kind of moss and many of the pools were deep, it presented no serious difficulties. In about twenty minutes he had reached the top, and as far as he could judge by shouting and noticing the echo he was now in a very large cave indeed. He took the stream for guidance and proceeded to follow it up. In that featureless dark it was some sort of company. Some real hope - distinct from that mere convention of hope which supports men in desperate situations - began to enter his mind.
It was shortly after this that he began to be worried by the noises. The last faint booming of the sea in the little hole whence he had set out so many hours ago had now died away and the predominant sound was the gentle tinkling of the stream. But he now began to think that he heard other noises mixed with it. Sometimes it would be a dull plump as if something had slipped into one of the pools behind him: sometimes, more mysteriously, a dry rattling sound as if metal were being dragged over the stones. At first he put it down to imagination. Then he stopped once or twice to listen and heard nothing;, but each time when he went on it began again. At last, stopping once more, he heard it quite unmistakably. Could it be that the Un-man had after all come to life and was still following him? But that seemed improbable, for its whole plan had been to escape. It was not so easy to dispose of the other possibility - that these caverns might have inhabitants. All his experience, indeed, assured him that if there were such inhabitants they would probably be harmless, but somehow he could not quite believe that anything which lived in such a place would be agreeable, and a little echo of the Un-man's - or was it Weston's - talk came back to him. "All beautiful on the surface, but down inside - darkness, heat, horror, and stink." Then it occurred to him that if some creature were following him up the stream it might be well for him to leave its banks and wait till the creature had gone past. But if it were hunting him it would presumably hunt by scent; and in any case he would not risk losing the stream. In the end he went on.
Whether through weakness - for he was now very hungry indeed - or because the noises behind made him involuntarily quicken his pace, he found himself unpleasantly hot, and even the stream did not appear very refreshing when he put his feet in it. He began to think that whether he were pursued or not he must have a short rest - but just at that moment he saw the light. His eyes had been mocked so often before that he would not at first believe it. He shut them while he counted a hundred and looked again. He turned round and sat down for several minutes, praying that it might not be a delusion, and looked again. "Well," said Ransom, "if it is a delusion, it's a pretty stubborn one." A very dim, tiny, quivering luminosity, slightly red in colour, was before him. It was too weak to illuminate anything else and in that world of blackness he could not tell whether it was five feet or five miles away. He set out at once, with beating heart. Thank Heaven, the stream appeared to be leading him towards it.
While he thought it was still a long way off he found himself almost stepping into it. It was a circle of light lying on the surface of the water, which thereabouts formed a deepish trembling pool. It came from above. Stepping into the pool he looked up. An irregularly shaped patch of light, now quite distinctly red, was immediately above him. This time it was strong enough to show him the objects immediately around it, and when his eyes had mastered them he perceived that he was looking up a funnel or fissure. Its lower aperture lay in the roof of his own cavern which must here be only a few feet above his head: its upper aperture was obviously in the floor of a separate and higher chamber whence the light came. He could see the uneven side of the funnel, dimly illuminated, and clothed with pads and streamers of a jelly-like and rather unpleasing vegetation. Down this water was trickling and falling on his head and shoulders in a warm rain. This warmth, together with the red colour of the light, suggested that the upper cave was illuminated by subterranean fire. It will not be clear to the reader, and it was not clear to Ransom when he thought about it afterwards, why he immediately decided to get into the upper cave if he possibly could. What really moved him, he thinks, was the mere hunger for light. The very first glance at the funnel restored dimensions and perspective to his world, and this in itself was like delivery from prison. It seemed to tell him far more than it actually did of his surroundings: it gave him back that whole frame of spatial directions without which a man seems hardly able to call his body his own. After this, any return to the horrible black vacancy, the world of soot and grime, the world without size or distance, in which he had been wandering, was out of the question. Perhaps also he had some idea that whatever was following him would cease to follow if he could get into the lighted cave.
But it was not easy to do. He could not reach the opening of the funnel. Even when he jumped he only just touched the fringe of its vegetation. At last he hit upon an unlikely plan which was the best he could think of. There was just enough light here for him to see a number of larger stones among the gravel, and he set to work to build up a pile in the centre of the pool. He worked rather feverishly and often had to undo what he had done: and he tried it several times before it was really high enough. When at last it was completed and he stood sweating and shaky on the summit the real hazard was still to be run. He had to grip the vegetation on each side above his head, trusting to luck that it would hold, and half jump, half pull himself up as quickly as he could, since if it held at all it would, he felt sure, not hold for long. Somehow or other he managed it. He got himself wedged into the fissure with his back against one side and his feet against the other, like a mountaineer in what is called a chimney. The thick squashy growth protected his skin, and after a few upward struggles he found the walls of the passage so irregular that it could be climbed in the ordinary way. The heat increased rapidly. "I'm a fool to have come up here," said Ransom: but even as he said so, he was at the top.