"Now comes the ticklish part of the business," Costigan informed the others. His helmet was slowly turning this way and that, and the others knew that through his spy-ray goggles he was studying their route. "There's only one boat we stand a chance of reaching, and somebody's mighty apt to see us. There's a lot of detectors up there, and we'll have to cross a corridor full of communicator beams. There, that line's off—scoot!"
At his word they dashed out into the hall and hurried along for minutes, dodging sharply to right or left as the leader snapped out orders. Finally he stopped.
"Here's those beams I told you about. We'll have to roll under 'em. They're less than waist high—right there's the lowest one. Watch me do it, and when I give you the word, one at a time, you do the same. Kee
