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Updated: May 3, 2025
"We've picked up nothing on sonar!" "Check again," Tom ordered. The sonarman bent to his scope and Hank listened intently over the hydrophones. Neither could detect any sign of another craft. "Probably the same one that fired on us the last time," Tom said grimly. "We'd better clear out before they take another pot shot at us."
Tom took over the hydrophones. Sure enough, his ears could make out the faint hum of the jetmarine's atomic turbines. Tom directed Hank toward the sound, then ordered him to switch on the Sea Hound's powerful search beam. The light cut a path of radiance through the murky dark-green waters. Dead ahead, the jetmarine could be seen gliding across their field of view.
So we'll have to camouflage it lose it in the underwater jungle noises, so to speak." Bud scratched his head. "How do we do that?" "By amplifying the natural undersea sounds all about it," Tom explained. "Fish and all forms of underwater life make a background noise over the hydrophones, you know."
"A Navy sub, maybe?" suggested Zimby. Bud shrugged. "Let's find out." He ordered a change of course, hard to the right, and gunned the jets to bring the jetmarine directly on the mystery object's trail. "It's a sub, all right," he said a short time later, listening again over the hydrophones. "Pretty close to Fearing Island, isn't it?" put in Mel Flagler. "That's a government-restricted area."
Hydrophones and other listening devices, though at first more highly perfected by the enemy, were so developed during the war as to enable patrol vessels to discover the presence and even determine the course and speed of a submerged foe.
Testifying before a German investigation committee, Captain Bartenbach, of the V-boat section of the German Admiralty, gave the chief perils encountered by his boats as follows: mines, Allied submarines, which "destroyed a whole series of our boats," aircraft of all types, armed merchantmen, hydrophones and listening devices.
"But a little smart maneuvering can cover up that angle," Tom added. "Try the hydrophones, Arv, and see if you can hear 'em." The chief modelmaker slipped on the earphones and listened intently. For another ten or fifteen minutes they probed about with no sound trace of the "invisible" jetmarine. But presently Arv snapped his fingers to catch Tom's attention. "Got her, skipper!"
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