"Tom Swift and His Jetmarine" The New Tom Swift Jr. Adventures by Victor Appleton II

The jetmarine, the second great invention of Tom Swift, takes the young inventor into a desperate battle with bold modern pirates who have been ravaging the sea lanes. Attacking with a sinister blackout weapon, the Sea Snipers have sent a passenger liner to the bottom — and Tom’s chief engineer is missing! The treacherous enemy pulls no punches in trying to wreck Tom’s atom-powered submersible, able to travel faster and deeper beneath the seas than any craft known to man. From the warm Caribbean to the coast of Portugal, the pace continues on and under the sea, in the air, in a haunting sea-bottom derelict, and in the raiders’ hidden sanctuary beneath the waves. Finally an audacious race to break the speed of sound underwater becomes a race against time to save America’s Atlantic coast from disaster!