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Damon, "doesn't that seem a foolish thing to do?" "It's the only thing to do, I believe," was the answer. "This mud is of a peculiar sticky and holding kind. The sub's nose is in it like a peg in a hole. What I propose to do now is to enlarge the hole, and then our nose will come loose I hope." "But you haven't any right to shove our nose further in!" cried Mr. Hardley. "I won't allow it!
As Bud nodded, Tom went on, "So we simply step up the volume till the sub's own noise gets drowned out or 'wasted' in all the racket." This could be done, he concluded, with fairly simple amplifying equipment. Bud, Hank, and Arv were jubilant at the idea. "Nice going," Bud said. "How soon can we give it a try?" "Soon as I can rig up the amplifier," Tom promised.
Tom explained the results of the test and the need for an added safeguard against hydrophone detection. "Think I see a simple way out, though," he added with a pleased chuckle. "Natch! With a brain like yours, it's a cinch," Bud quipped. "Explain, professor." "Well, we can never do away with the noise of a sub's propulsion machinery," Tom began. "That goes without saying.
"The sub's submerging again," he reported. "That'll give us a clear field. Zimby, you and Mack keep an eye on that baby while we're gone, and be plenty careful she doesn't spot you!" "Roger! And take this roll of wire to tie up your prisoners." Hastily Bud and Mel changed into swimming trunks and donned hydrolungs.
"Your system blinded our sonar okay, skipper," Hank commented, "but this proves she could still be spotted by enemy listening devices." Tom refused to be discouraged. He ordered Hank to return to base and wait for Bud. Meanwhile, the young inventor applied himself to the problem of how to mask the sub's noise. "How about it, pal?" Bud asked, when he reported aboard the seacopter a while later.
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