Plot Synopsis

Father-and-son professional divers Mike and Warren Fletcher go beneath the waters to unravel mysteries that involve war, hidden treasure, disaster, science, and archaeology. The Fletchers travel the world, from the murky depths of the Mekong River to the warm, clear seas of the Caribbean to the frigid waters of the Canadian Great Lakes. Smithsonian aired the U.S. premiere of the series on Sunday, April 3, 2011 at 8pm ET. As a result of the Fletchers' investigation of the sinking of the Edmund Fitzgerald on Lake Superior, new evidence prompted Gordon Lightfoot to change the lyrics of his iconic song, "The Wreck of the Edmund Fitzgerald."