Abruptly, he stopped fighting and stared at the hole.

A figure had crawled out of it, a figure in a pressure-suit.

Now he shouted with joy. Whether the figure was Martian or not, it was built like a member of Homo sapiens. It could be presumed to be intelligent and therefore curious.

He was not disappointed. The suited being stood up on two hemispheres of shiny red metal and began walking toward him in a sliding fashion. Reaching him, it handed him the end of a plastic rope it was carrying under its arm.

He almost dropped it. His rescuer's suit was transparent. It was enough of a shock to see clearly the details of the creature's body, but the sight of the two heads within the helmet caused him to turn pale.

The Martian slidewalked to the tube from which Lane had leaped. It jumped lightly from the two bowls on which it had stood, landed on the three-foot high top of the tube, and began hauling Lane out from the mess. He came out slowly but steadily and soon was scooting forward, gripping the rope. When he reached the foot of the tube, he was hauled on up until he could get his feet in the two bowls. It was easy to jump from them to a place beside the biped.

It unstrapped two more bowls from its back, gave them to Lane, then lowered itself on the two in the garden. Lane followed it across the mire.

Entering the hole, he found himself in a chamber so low he had to crouch. Evidently, it had been constructed by the dekapeds and not by his companion for it, too, had to bend its back and knees.

Lane was pushed to one side by some dekapeds. They picked up the thick plug, made of the same gray stuff as the tube walls, and sealed the entrance with it. Then they shot out of their mouths strand after strand of gray spiderwebby stuff to seal the plug.

The biped motioned Lane to follow, and it slid down a tunnel which plunged into the earth at a forty-five degree angle. It illuminated the passage with a flashlight which it took from its belt. They came into a large chamber which contained all of the fifty dekapeds. These were waiting motionless. The biped, as if sensing Lane's curiosity, pulled off its glove and held it before several small vents in the wall. Lane removed his glove and felt warm air flowing from the holes.

Evidently this was a pressure chamber, built by the ten-legged things. But such evidence of intelligent engineering did not mean that these things had the individual intelligence of a man. It could mean group intelligence such as Terrestrial insects possess.

After a while, the chamber was filled with air. Another plug was pulled; Lane followed the dekapeds and his rescuer up another forty-five degree tunnel. He estimated that he would find himself inside the tube from which the biped had first come. He was right. He crawled through another hole into it.

And a pair of beaks clicked as they bit down on his helmet!

Automatically, he shoved at the thing, and under the force of his blow the dekaped lost its bite and went rolling on the floor, a bundle of thrashing legs.

Lane did not worry about having hurt it. It did not weigh much, but its body must be tough to be able to plunge without damage from the heavy air inside the tube into the almost-stratospheric conditions outside.

However, he did reach for the knife at his belt. But the biped put its hand on his arm and shook one of its heads.

Later, he was to find out that the seeming bite must have been an accident. Always -- with one exception -- the leggers were to ignore him.

He was also to find that he was lucky. The leggers had come out to inspect their garden because, through some unknown method of detection, they knew that the plantlets had been disturbed. The biped normally would not have accompanied them. However, today, its curiosity aroused because the leggers had gone out three times in three days, it had decided to investigate.

The biped turned out its flashlight and motioned to Lane to follow. Awkwardly, he obeyed. There was light, but it was dim, a twilight. Its source was the many creatures that hung from the ceiling of the tube. These were three feet long and six inches thick, cylindrical, pinkish-skinned, and eyeless. A dozen frondlike limbs waved continuously, and their motion kept air circulating in the tunnel.

Their cold firefly glow came from two globular pulsing organs which hung from both sides of the round loose-lipped mouth at the free end of the creature. Slime drooled from the mouth, and dripped onto the floor or into a narrow channel which ran along the lowest part of the sloping floor. Water ran in the six-inch deep channel, the first native water he had seen. The water picked up the slime and carried it a little way before it was gulped up by an animal that lay on the bottom of the channel.

Lane's eyes adjusted to the dimness until he could make out the water-dweller. It was torpedo-shaped and without eyes or fins. It had two openings in its body; one obviously sucked in water, the other expelled it.

He saw at once what this meant. The water at the North Pole melted in the summertime and flowed into the far end of the tube system. Helped by gravity and by the pumping action of the line of animals in the channel, the water was passed from the edge of the Pole to the equator.

Leggers ran by him on mysterious errands. Several, however, halted beneath some of the downhanging organisms. They reared up on their hind five legs and their tongues shot out and into the open mouths by the glowing balls. At once, the fire-worm -- as Lane termed it -- its cilia waving wildly, stretched itself to twice its former length. Its mouth met the beak of the legger, and there was an exchange of stuff between their mouths.

Impatiently, the biped tugged at Lane's arm. He followed it down the tube. Soon they entered a section where pale roots came down out of holes in the ceiling and spread along the curving walls, gripping them, then becoming a network of many thread-thin rootlets that crept across the floor and into the water of the channel.

Here and there a dekaped chewed at a root and then hurried off to offer a piece to the mouths of the fireworms.

After walking for several minutes, the biped stepped across the stream. It then began walking as closely as possible to the wall, meanwhile looking apprehensively at the other side of the tunnel, where they had been walking.

Lane also looked but could see nothing at which to be alarmed. There was a large opening at the base of the wall which evidently led into a tunnel. This tunnel, he presumed, ran underground into a room or rooms, for many leggers dashed in and out of it. And about a dozen, larger than average, paced back and forth like sentries before the hole.

When they had gone about fifty yards past the opening, the biped relaxed. After it had led Lane along for ten minutes, it stopped. Its naked hand touched the wall. He became aware that the hand was small and delicately shaped, like a woman's.

A section of the wall swung out. The biped turned and bent down to crawl into the hole, presenting buttocks and legs femininely rounded, well shaped. It was then that he began thinking of it as a female. Yet the hips, though padded with fatty tissue, were not broad. The bones were not widely separated to make room to carry a child. Despite their curving, the hips were relatively as narrow as a man's.

Behind them, the plug swung shut. The biped did not turn on her flashlight, for there was illumination at the end of the tunnel. The floor and walls were not of the hard gray stuff nor of packed earth. They seemed vitrified, as if glassed by heat.

She was waiting for him when he slid off a three-foot high ledge into a large room. For a minute he was blinded by the strong light. After his eyes adjusted, he searched for the source of light but could not find it. He did observe that there were no shadows in the room.