He began to need air. He backed carefully out and rose above the water, gasping. After a while his hard breathing stopped, and he sat staring at the water for a long while. When it was dark, he left.
The next day he came and crept underwater to the grabbing area of the storklike machine again. He scooped out several handfuls of the gravel from under the place where the arms grabbed, before he felt a desperate need for air and had to withdraw. But that day began his labors.
IV
Four days later the bottom under the grasping tentacles was scooped out to an additional two feet of depth. And the fifth twilight after that, he pulled himself, dripping and triumphant, up out of the bend of the diverted stream inside the circle of the killing wands.
He rested and then went to the pyramid, approaching it cautiously and sidelong like a suspicious animal. There was a door in the side he approached through which he had seen the prospecting machines trundle in and out. In the dimness he could not see it; and when he touched the metallic side of the structure, his fingers, grimed and toughened from scrabbling in the dirt, told him little. But his nose, beast-sensitive now, located and traced the outline of the almost invisible crack around the door panel by its reek of earth and lubricant.
He settled down to wait. An hour later, one of the machines came back. He jumped up, ready to follow it in; but the door opened just before it and closed the minute it was inside—nor was there any room to squeeze in beside it. He hunkered down, disappointed, snarling a little to himself.
He stayed until dawn and watched several more machines enter and leave. But there was no room to squeeze inside, even with the smallest of them.
During the next week or so he watched the machines enter and leave nightly. He tied one of his small animals to an entering machine and saw it pass through the entrance alive and scamper out again with the next machine that left. And every flight his rage increased. Then, wordlessly, one daytime after he had seen a machine deep in the woods lurch and tilt as its tread passed over a rock, inspiration took him.
That night he carried through the water with him several cantaloupe-sized stones. When the first machine came back to the pyramid, in the moment in which the door opened before it, he pushed one of the rocks before the right-hand tread. The machine, unable to stop, mounted the rock with its right tread, tilted to the left, and struck against that side of the entrance.
It checked, backed off, and put out an arm with the grasping end to remove the rock. Then it entered the opening. But Harry was already before it, having slipped through while the door was still up and the machine busy pulling the stone aside.
He plunged into a corridor of darkness, full of clankings and smells. A little light from the opening behind him showed him a further, larger chamber where other machines stood parked. He ran toward them.
Long before he reached them, the door closed behind him, and he was in pitch darkness. But the clanking of the incoming machine was close behind him, and the adrenalinized memory of a wild beast did not fail him. He ran, hands outstretched, directly into the side of the parked machine at which he had aimed and clambered up on it. The machine entering behind him clanked harmlessly past him and stopped moving.
He climbed cautiously down in the impenetrable darkness. He could see nothing; but the new, animal sensitivity of his nose offered a substitute for vision. He moved like a hunting dog around the chamber, sniffing and touching; and slowly a clear picture of it and its treaded occupants built up in his mind.
He was still at this when suddenly a door he had not seen opened almost in his face. He had just time to leap backward as a smaller machine with a boxlike body and a number of upward-thrusting arms entered, trundled to the machine that had just come back, and began to relieve the prospecting machine of its sample box, replacing it with the one it carried itself.
This much, in the dim light from the open door, Harry was able to see. But then, the small machine turned back toward the doorway; and Harry, waking to his opportunity, ducked through ahead of it.
He found himself in a corridor dimly lit by a luminescent strip down the center of the ceiling. The corridor was wide enough for the box-collecting machine to pass him; and, in fact, it rolled out around him as he shrank back against one metal wall. It went on down the corridor, and he followed it into a larger room with a number of machines, some mobile, some not, under a ceiling lit as the corridor had been with a crossing of luminescent strip.
In this area all the machines avoided each other—and him. They were busy with each other and at other incomprehensible duties. Hunched and tense, hair erect on the back of his neck and nostrils spread wide, Harry moved through them to explore other rooms and corridors that opened off this one. It took him some little time; but he discovered that they were all on a level, and there was nothing but machines in any of them. He found two more doors with shallow steps leading up to them, but these would not open for him; and though he watched by one for some time, no machine went up the steps and through it.
He began to be conscious of thirst and hunger. He made his way back to the door leading to the chamber where the prospecting machines were parked. To his surprise, it opened as he approached it. He slipped through into darkness.
Immediately, the door closed behind him; and sudden panic grabbed him, when he found he could not open it from this side. Then, self-possession returned to him.
By touch, smell, and memory, he made his way among the parked machines and down the corridor to the outside door. To his gratification, this also opened when he came close. He slipped through into cool, fresh outer air and a sky already graying with dawn. A few moments later, wet but free, he was back in the woods again.
From then on, each night he returned. He found it was not necessary to do more than put any sizable object before the returning machine. It would stop to clear the path, and he could enter ahead of it. Then, shortly after he was inside, a box-collecting machine would open the inner door.
Gradually, his fear of the machines faded. He came to hold them in a certain contempt. They always did the same thing in the same situation, and it was easy to trick or outmaneuver them.
But the two inner doors of the machine area with the steps would not open to him; and he knew the upper parts of the pyramid were still unexplored by him. He sniffed at the cracks of these doors, and a scent came through—not of lubricating medium and metal alone, but of a different, musky odor that raised the hairs on the back of his neck again. He snarled at the doors.
He went back to exploring minutely the machine level. The sample boxes from the prospecting machines, he found, were put on conveyor-beltlike strips that floated up on thin air through openings in the ceiling—but the openings were too small for him to pass through. But he discovered something else. One day he came upon one of the machines taking a grille off the face of one of the immobile devices. It carried the grille away, and he explored the opening that had been revealed. It was the entrance to a tunnel or duct leading upward; and it was large enough to let him enter it. Air blew silently from it; and the air was heavy with the musky odor he had smelled around the doors that did not open.
The duct tempted him, but fear held him back. The machine came back and replaced the grille; and he noticed that it fitted into place with a little pressure from the outside, top and bottom. After the machine had left he pressed, and the grille fell out into his hands.
After a long wait, he ventured timorously into the tube—but a sudden sound like heavy breathing mixed with a wave of a strong, musky odor came at him. He backed out in panic, fled the pyramid, and did not come back for two days.