"Who knows?" a sergeant replied.

They had seen the airlock open and close, but knowing that Harris was still inside, they had thought little of it. Still, it was odd.

The airlock door swung open again. Harris stepped out, looking dazed. The lieutenant ran toward him, and quickly the engineer explained what had happened.

"You mean he's inside there? We've got to stop him!"

"It's too late," Harris said. "He didn't know that I was doing some adjusting inside there. Go ahead and look."

The lieutenant went to the inner door of the airlock and peered in. The whole inside of the ship was gone, vanished as though it had never been.

"I had just made a slight adjustment of the generator." Harris said quietly. "The power field was cut down, so the projector field was smaller. I'm afraid our spy simply projected the inside of the spaceship out into the interstellar vacuum and left the hull behind."

He shook his head grimly. "Poor devil. He'll have quite a surprise in store for him—unless he can live without air!"