"Into the Deep" watches scientists unlock secrets from the last frontier on Earththe ocean's depths, where explorer Bob Ballard is changing science, history, and the future. "The Uncivilized Engine of War" traces the world's first submarine attackon the Union warship Housatonic, in February 1864. In 1995, after a lengthy search, shipwreck hunter Clive Cussler's team located the Confederate sub Hunley, now in dry dock in South Carolina.