They worked four hours beyond the regular shift before Crag gave the signal to stop. The cables had been fastened to Red Dog--the winches set. Now it was poised on the brink of the rill, ready for lowering into the black depths. Crag was impatient to push ahead but he knew the men were too tired. Even the iron-bodied Larkwell was faltering. It would be too risky. Yet he only reluctantly gave the signal to start back toward Bandit. They trudged across the plain--five black blobs, five shadows plodding through a midnight pit. Crag led the way. The earth overhead gleamed with a yellow-green light. The stars against the purple-black sky were washed to a million glimmering pinpoints. The sky, the crater, the black shadows etched against the blacker night bespoke the alienage of the universe. Arzachel was the forgotten world. More, a world that never was. It was solid matter created of nothingness, floating in nothingness, a minute speck adrift in the terrible emptiness of the cosmos. He shivered. It was an eery feeling. He reached Bandit and waited for the others to arrive. Prochaska, fresher than the others, was first on the scene. He threw a mock salute to Crag and started up the ladder. Larkwell and Richter arrived moments later. He watched them approach. They seemed stooped--like old men, he thought--but they gave him a short nod before climbing to the space cabin. He was beginning to worry before Nagel finally appeared. The oxygen man was staggering with weariness, barely able to stand erect. Crag stepped aside. "After you, Gordon." "Thanks, Skipper." Crag anxiously watched while Gordon pulled his way up the rope ladder. He paused halfway and rested his head on his arms. After a moment he resumed the climb. Crag waited until he reached the cabin before following. Could Nagel hold out? Could a man die of sheer exhaustion? The worry nibbled at his mind. Maybe he should give him a day's rest--let him monitor the communicator. Or just sleep. As it was his contribution to their work was nil. He did little more than go through the motions. Crag debated the problem while they pressurized the cabin and removed their suits. What would Gotch do? Gotch would drive him till he died. That's what Gotch would expect him to do. No, he couldn't be soft. Even Nagel's slight contribution might make the difference between success or failure. Life or death. He would have to ride it out. Crag set his lips grimly. He had felt kinder toward the oxygen man since that brief period when Nagel had let him peer into his mind. Now ... now he felt like his executioner. Just when he was beginning to understand the vistas of Nagel's being. But understanding and sympathizing with Nagel made his task all the more difficult. Impatiently he pushed the problem from his mind. There were other, bigger things he had to consider. Like the warhead.