He debated the pros and cons. In the end he decided it would not be politic to forbid Nagel to handle the gear during flight. He was, after all, their oxygen equipment specialist. He contented himself with keeping a sharp watch on Nagel's activities--a situation Nagel seemed unmindful of. He seemed to have lost some of his earlier fear. His face was alert, almost cheerful at times; yet it held the attitude of watchful waiting. Despite his liking for Prochaska, Crag couldn't forget that he had failed to find the time bomb in a panel he had twice searched. Still, the console's complex maze of wiring and tubes had made an excellent hiding place. He had to admit he was lucky to have found it himself. He tried to push his suspicions from his mind without relaxing his vigilance. It was a hard job. By the third day the enemy missile had become a prime factor in the things he found to worry about. The intruder rocket had drawn closer. Alpine warned that the race was neck and neck. It had either escaped earth at a higher speed or had continued to accelerate beyond the escape point. Crag regarded the reason as purely academic. The hard fact was that it would eventually overtake the still decelerating Aztec. Just now it was a pip on the analog, a pip which before long would loom as large as Drone Able, perhaps as close. He tried to assess its meaning, vexed that Alpine seemed to be doing so little to help in the matter. Later Larkwell spotted the pip made by the East's rocket on the scope. That let the cat out of the bag as far as Crag was concerned. Soberly he informed them of its origin. Larkwell bit his lip thoughtfully. Nagel furrowed his brow, seemingly lost in contemplation. Prochaska's expression never changed. Crag assessed each reaction. In fairness, he also assessed his own feeling toward each of the men. He felt a positive dislike of Nagel and a positive liking for Prochaska. Larkwell was a neutral. He seemed to be a congenial, open-faced man who wore his feelings in plain sight. But there was a quality about him which, try as he would, he could not put his finger on. Nagel, he told himself, must have plenty on the ball. After all, he had passed through a tough selection board. Just because the man's personality conflicted with his own was no grounds for suspicion. But the same reasoning could apply to the others. The fact remained--at least Gotch seemed certain--that his crew numbered a ringer among them. He was mulling it over when the communicator came to life. The message was in moon code. It came slowly, widely spaced, as if Gotch realized Crag's limitations in handling the intricate cipher system evolved especially for this one operation. Learning it had caused him many a sleepless night. He copied the message letter by letter, his understanding blanked by the effort to decipher it. He finished, then quickly read the two scant lines: "_Blank channel to Alp unless survival need._"