"I think it has to do with a geepee. I thought they all dropped outside. Maybe there was one that didn't."

"Why a geepee?" she asked blankly.

"In the first place, no man is strong enough to move the combustion cap. But if he should somehow manage to exert super-human effort, as soon as the cap cleared the tubes, rocket action would cease. The air in the compartment would exhaust into space and anyone in there would die."

"So we have a dead geepee in there."

"A geepee doesn't die. Not even become inactive; it doesn't need air." Docchi tried to think the thing through. "Not only that, a geepee might be able to escape from the compartment. The lock would close as soon as the pressure dropped. But a geepee...."

Anti settled down grimly. "Then there's a geepee on the loose, intent on sabotage?"

"I'm afraid so," he admitted worriedly.

"What are we standing here for? We'll go back to controls and pick up the robot on radio. What it damaged, it can repair." She was partly turned around now and saw Docchi's face. "Don't tell me," she said. "I suppose I should have thought of it. The signal doesn't work inside the ship."

Docchi nodded. "It doesn't. Robots are never used aboard, so the control is set in the bow antenna and the ship, of course, is insulated."

"Well," said Anti happily, "we've got a robot hunt ahead of us."