During World War II the passenger liner "Goliath" is sunk by a German submarine. Portions of the ship's hull remain airtight, and some of the passengers and crew survive. Over the decades they build a rigidly regulated society completely isolated from the surface world until, in contemporary times, a diving team begins to explore the wreck.

From across the world, from four continents and every ocean, come tales of triumph and tragedy at sea, each story featuring cutting edge maritime archaeology.

The ocean floor is home to centuries' worth of sunken vessels integrated into marine habitats. Explore extraordinary wrecks around the world and learn how these artificial structures have become a part of the ecosystem--and in some cases, a vital tool in reversing the effects of human impact.