Examines submarine warfare and the espionage operations between the USA, the USSR, and their allies.

At the height of World War II, a young submarine crew heads out to sea on a top-secret mission that all but ensures most will never make it home alive. Ordered to patrol the Atlantic and destroy an allied armada bringing supplies to Britain, these raw recruits must band together, bracing themselves against a depth-charge assault from an unseen enemy. Can the captain and his crew summon the strength to escape their watery grave?

Follows the daring patrol of U-96, one of the famed German U-boats known as the "gray wolves."

Describes the creation of an underwater ship called the American Turtle by Yale graduate David Bushnell in 1776, and its use in an attempt to sink the British navy's flagship, the HMS Eagle, in New York harbor.

A Navy frogman under secret orders is whisked from a stateside romance to the perils of warfare in the South Pacific in 1942.

"In March 1941, after a year of unbroken and devastating U-boat onslaughts, the British War Cabinet decided to try a new strategy in the foundering naval campaign. To do so, they hired an intensely private, bohemian physicist who was also an ardent socialist. Patrick Blackett was a former navy officer and future winner of the Nobel Prize; he is little remembered today, but he and his fellow scientists did as much to win the war against Nazi Germany...