Ross's imagination jumped from fact to theory. The torpedo craft could be an atomic jet. All right, he had been in bad shape when he fell into it by chance and the bed machine had caught him as if it had been created for just such a duty. What kind of a small plane would be equipped with a restorative apparatus? Only one intended to handle emergencies, to transport badly injured living things who had to leave the building in a hurry. In other words, a lifeboat! But why would a building need a lifeboat? That would be rather standard equipment for a ship. Ross stepped into the corridor and stared about him with open and incredulous wonder. Could this be some form of ship, grounded here, deserted and derelict, and now being plundered by the Reds? The facts fitted! They fitted so well with all he had been able to discover that Ross was sure it was true. But he determined to prove it beyond all doubt. He closed the door leading to the lifeboat berth, but not so securely that he could not open it again. That was too good a hiding place. On his cushioned feet he padded back to the stairway, and he stood there listening. Far below were sounds, a rasp of metal against metal, a low murmur of muted voices. But from above there was nothing, so he would explore above before he ventured into that other danger zone. Ross climbed, passing two more levels, to come out into a vast room with a curving roof which must fill the whole crown of the globe. Here was such a wealth of machines, controls, things he could not understand that he stood bewildered, content for the moment merely to look. There were--he counted slowly--five control boards like those he had seen in the small escape ship. Each of these was faced by two or three of the bucket-seats, only these swung in webbing. He put his hand on one, and it bobbed elastically. The control boards were so complicated that the one in the lifeboat might have been a child's toy in comparison. The air in the ship had been good; in the lifeboat it had held the pleasant odor of the jelly; but here Ross sniffed a faint but persistent hint of corruption, of an old malodor. He left the vantage point by the stairs and paced between the control boards and their empty swinging seats. This was the main control room, of that he was certain. From this point all the vast bulk beneath him had been set in motion, sailed here and there. Had it been on the sea, or through the air? The globe shape suggested an air-borne craft. But a civilization so advanced as this would surely have left some remains. Ross was willing to believe that he could be much farther back in time than 2000 B.C., but he was still sure that traces of those who could build a thing like this would have existed in the twentieth century A.D. Maybe that was how the Reds had found this. Something they had turned up within their country--say, in Siberia, or some of the forgotten corners of Asia--had been a clue.