World War II left the greatest-ever number of ships and submarines hidden beneath the waves. Now, as the oceans drain, each vessel reveals its secrets through new data-based 3D reconstructions. From the Arizona in Pearl Harbor's shallows, whose destruction brought America into the war, to Nazi supership, the Bismarck, and its mysterious end three miles down; from the flaming merchant ships secretly torpedoed by U-boats off tourist beaches of the USA, to the covert inventions of the Allies' costly D-Day beachhead, and lastly to the troopship Leopoldville sunk with the needless deaths of 400 soldiers hushed up - Drain exposes the truth.

The hunt for a legendary ghost ship in Alaska reveals a corner of the United States once known as "Russian America." The Kad'yak was a Russian three-masted bark that sank in Icon Bay off Kodiak Island in 1860. It was bound for San Francisco, California, with a cargo of ice.

Draining Alaska's extreme north reveals the graveyard of a tragic fleet. The 1871 Whaling Disaster occurred when pack ice off Alaska's North Slope trapped 32 whaling ships.