Tom Swift and His Oceanic Subliminator

In this 4th novel in the series, Tom is asked to help save the crew of a sunken nuclear submarine, and then to recover the actual sub before it can be claimed as salvage and stripped of its top secrets by a foreign power. His successful efforts lead him to being requested to undertake a monumental task: locating and recovering the more than half-dozen "lost" nuclear submarines sitting on the bottom of several of the Earth's oceans. More than that, he must also find their nuclear-tipped torp...