The rockets thrust at his body, jamming him against the quartz. He snapped the studs shut. It had seemed, for a moment, that the plate had given just a little.

Drawing in a deep breath, he twisted the studs again. Once more his body slammed against the plate, driven by the flaming tubes.

Suddenly the plate gave way, swung in and plunged him down into the laboratory. Savagely he snapped the studs shut. He struck hard against the floor, cracked his helmet soundly.

Groggily he groped his way to his feet. The thin whine of escaping atmosphere came to his ears and unsteadily he made his way forward. Leaping at the plate, he slammed it back into place again. It closed with a thud, driven deep into its frame by the force of rushing air.

A chair stood beside a table and he swung around, sat down in it, still dizzy from the fall. He shook his head to clear away the cobwebs.

There was atmosphere here. That meant that an atmosphere generator still was operating, that the ship had developed no leaks and was still airtight.

He raised his helmet slightly. Fresh pure air swirled into his nostrils, better air than he had inside his suit. A little highly oxygenated, perhaps, but that was all. If the atmosphere machine had run for a long time unattended, it might have gotten out of adjustment slightly, might be mixing a bit too much oxygen with the air output.

He swung the helmet back and let it dangle on the hinge at the back of the neck, gulped in great mouthfuls of the atmosphere. His head cleared rapidly.

He looked around the room. There was little that he had not already seen. A practical, well-equipped laboratory, but much of the equipment, he now realized, was old.

Some of it was obsolete and that fitted in with all the rest of it.