. "Hitler's sunken secret: One of the most daring resistance operations of World War II was the 1944 sinking of the Norwegian ferry Hydro, with its cargo of \"heavy water\" destined for the Nazi's secret atomic bomb project."@en . "Nova Hitler's lost sub" . . . . . . . . . . . "Fifty years after World War II, a team of divers discovered an unidentified German U-boat off the New Jersey coast. What boat was it? And what secret mission had brought it there? This video also traces the history of submarines and undersea warfare from the American Revolution through World War II."@en . "Television programs"@en . . . "Documentary television programs"@en . . . "Video recordings for people with visual disabilities"@en . . . . . . . . . . . . "Video recordings for the hearing impaired"@en . . . . "Hitler's lost sub"@en . "Hitler's lost sub" . . . . . . "Hitler's lost sub: America had just entered World War II, but terrifying unseen weapons were stalking US targets, sinking over 400 ships just miles from American shores in the worst naval defeat in United States History."@en . . . . . . . . "Documentary"@en . . . . . . . . . "Nazi secrets revealed"@en . . . . . . . . "Navy divers work to excavate an unidentified German U-boat off the New Jersey coast. Bringing closure to the families of its lost crew and how one man's life was spared." . . . . . . . . . . "World War, 1939-1945 Naval operations, German." . . "Deuterium oxide." . . "World War, 1939-1945 Naval operations Submarine." . . "World War, 1939-1945 Underground movements." . . . . "Submarines Germany." . . "1939 - 1945" . . "National Geographic Channel International (Firm)" . . "Atomic bomb Germany." . . "Submarine warfare." . .