Bob turned with the intention of making his Dutch chum take the hand he released, but Carl had faded mysteriously out of the periscope room. Whether he expected what was coming, or not, and dodged away to avoid meeting the issue, Bob could only guess.

“Dick,” and Bob turned to his sailor chum, “I want you——”

“Here we are,” cried Dick, “just taking the entrance to South Channel. And it’s the right channel, too, because we slammed right past that other one where we go in and come out the same place.”

Glennie could not fail to note how both Carl and Dick had avoided Bob’s attempt to put him on more friendly footing with them. There was a noticeable constraint in his manner, but he did not allow it to interfere with his stating the desire he had in his head.

“When I came aboard,” he went on, “I believed I was merely the representative of the United States government, that I was to look on, keep hands off, and write up my own log. But I can see very plainly where I can be of service to you, Bob; and I can also see where, by helping you, I can get a much better insight into the capabilities of the Grampus. I should like to have you let me do my part in running the boat. If you want me for quartermaster, I can spell you, or Mr. Ferral; with a little instruction, I could also run the motor, or do the work in the tank room. If it would be any help, I might even learn to cook the meals. All I want is to be useful—and to learn the Grampus from top to bottom, inside and out, as well as you know her.”

Dick gave another grunt; but this time it was more subdued. The idea of any one learning the Grampus as well as Bob knew her! In order to do that, a fellow would have to be born with a working knowledge of explosive engines in his head—just as Bob had been.

“Thank you for that, Glennie!” said Bob. “You can get busy right now, if you want to.”

“Just tell me what I’m to do,” Glennie answered.

“Go up on deck and keep a sharp lookout while we’re passing through the channel. We must be vigilant, even when we can see no reason for it. Wily enemies are after us, and eternal watchfulness is the price of success, fully as much as it is of liberty.”