For the next few hours, Barrent stayed in the storage room. He was feeling very tired, and his joints had begun to ache. The air in the small room had a sour, exhausted smell. Forcing himself to his feet, Barrent walked to the air vent and put his hand over it. No air was coming through. He took a small gauge out of his pocket. The oxygen content of the room was falling rapidly.

Cautiously he opened the storeroom door and peered out. Although he was dressed in a perfect replica of guard's uniform, he knew he couldn't pass among men who knew each other so well. He had to stay in hiding. And he had to have air.

The corridors were deserted. He passed the guard assembly room and heard faint murmurs of conversation inside. The green light glowed brightly over the door. Barrent walked on, beginning to feel the first signs of dizziness. His gauge showed him that the oxygen content in the corridor was starting to fall.

The Group had assumed that the air system would be used throughout the ship. Now Barrent could see that, with only guards and crew aboard, there was no need to supply air for the entire ship. There would be air in the little man-inhabited islands of the guardroom and the crew's section, and nowhere else.

Barrent hurried down the dim, silent corridors, gasping for breath. The air was rapidly growing bad. Perhaps it was being used in the assembly room before the ship's main air supply was touched.

He passed unlocked doors, but the green bulbs above them were unlighted. He had a pounding headache, and his legs felt as if they were turning to jelly. He tried to figure out a course of action.

The crew's section seemed to offer him the best chance. Ship's personnel might not be armed. Even if they were, they would be less ready for trouble than the guards. Perhaps he could hold one of the officers at gunpoint; perhaps he could take over the ship.

It was worth trying. It had to be tried.

At the end of the corridor he came to a staircase. He climbed past a dozen deserted levels, and came at last to a stenciled sign on one of the walls. It read CONTROL SECTION, and an arrow pointed the way. Barrent took the plastic needlebeam out of his pocket and staggered down the corridor. He was beginning to lose consciousness. Black shadows formed and dissipated on the edges of his vision. He was experiencing vague hallucinations, flashes of horror in which he felt the corridor walls falling in on him. He found that he was on his hands and knees, crawling toward a door marked CONTROL ROOM — No Admittance except to Ship's Officers.

The corridor seemed to be filled with gray fog. It cleared momentarily, and Barrent realized that his eyes were not focusing properly. He pulled himself to his feet and turned the door handle. It began to open. He took a firm grip on the needlebeam and tried to prepare himself for action.

But, as the door opened, darkness closed irrevocably around him. He thought he could see startled faces, hear a voice shouting, "Watch out! He's armed!" And then the blackness closed in completely, and he fell endlessly forward.

Barrent's return to consciousness was sudden and complete. He sat up and saw that he had fallen inside the control room. The metal door was closed behind him, and he was breathing without difficulty. He could see no sign of the crew. They must have gone after the guards, assuming he would stay unconscious.

He scrambled to his feet, instinctively picking up his needlebeam. He examined the weapon closely, then frowned and put it away. Why, he wondered, would the crew leave him alone in the control room, the most important part of the ship? Why would they leave him armed?

He tried to remember the faces he had seen just before he collapsed. They were indistinct memories, vague and unfocused figures with hollow, dreamlike voices. Had there really been people in here?

The more he thought about it, the more certain he was that he had conjured those people out of his fading consciousness. There had been no one here. He was alone in the ship's nerve center.

He approached the main control board. It was divided into ten stations. Each section had its rows of dials, whose slender indicators pointed to incomprehensible readings. Each had its switches, wheels rheostats, and levers.

Barrent walked slowly past the stations, watching the patterns of flashing lights that ran to the ceiling and rippled along the walls. The last station seemed to be some kind of overall control for the rest. A small screen was marked: Coordination, Manual /Automatic. The Automatic part was lighted. There were similar screens for navigation, lookout, collision control, subspace entry and exit, normal space entry and exit, and landing. All were automatic. Further on he found the programming screen, which clicked off the progress of the flight in hours, minutes, and seconds. Time to Checkpoint One was now 29 hours, 4 minutes, 51 seconds. Stop-over time, three hours. Time from Checkpoint to Earth, 480 hours.

The control board flashed and hummed to itself, serene and self-sufficient. Barrent couldn't help feeling that the presence of a human in this temple of the machine was sacrilege.

He checked the air ducts. They were set for automatic feed, giving just enough air to support the room's present human population of one.

But where was the crew? Barrent could understand the necessity of operating a starship largely on an automatic programming system. A structure as huge and complex as this had to be self-sufficient. But men had built it, and men had punched out the programs. Why weren't men present to monitor the switchboards, to modify the program when necessary? Suppose the guards had needed more time on Omega? Suppose it became necessary to by-pass the checkpoint and return directly to Earth? Suppose it was imperative to change destination altogether? Who reset the programs, who gave the ship its orders, who possessed the guiding intelligence that directed the entire operation?

Barrent looked around the control room. He found a storage bin filled with oxygen respirators. He put one on, tested it, and went into the corridor.

After a long walk, he reached a door marked CREW'S QUARTERS. Inside, the room was neat and bare. The beds stood in neat rows, without sheets or blankets. There were no clothes in the closets, no personal possessions of any kind. Barrent left and inspected the officers' and captain's quarters. He found no sign of recent human habitation.

He returned to the control room. It was apparent now that the ship had no crew. Perhaps the authorities on Earth felt so certain of their schedules and of the reliability of their ship that they had decided a crew was superfluous. Perhaps….

But it seemed to Barrent a reckless way of doing things. There was something very strange about an Earth that allowed starships to run without human supervision.

He decided to suspend further judgment until he had acquired more facts. For the time being, he had to think about the problems of his own survival. There was concentrated food in his pockets, but he hadn't been able to carry much water. Would the crewless ship have supplies? He had to remember the detachment of guards, down below in their assembly room. And he had to think about what was going to happen at the checkpoint, and what he would do about it.

Barrent found that he did not have to use his own food supplies. In the officers' mess, machines still dispensed food and drink at the push of a button. Barrent didn't know if these were natural or chemically reconstituted foods. They tasted fine and seemed to nourish him, so he really didn't care.

He explored part of the ship's upper levels. After becoming lost several times, he decided not to take any more unnecessary risks. The life-center of the ship was its control room, and Barrent spent most of his time there.