 Shadow Divers

Shadow Divers (published in 2004) is a non-fictional book by Robert Kurson recounting of the discovery of a World War II German U-boat off the coast of New Jersey, United States in 1991.In 1991, a group of divers, including John Chatterton, set out on "Seeker" to explore an unknown object lying below the surface of the Atlantic Ocean and discover an apparent historical impossibility