In this two-hour special, Nova follows a team of divers down to the ocean floor for a six-year investigation that eventually determined the identity of a sunken World War II submarine -- and rewrote history in the process. The German U-Boat, first discovered in 1991 just 60 miles off the New Jersey coast, posed a significant challenge to would-be explorers; the program explains the kinds of dangers that even highly trained professional divers face under 230 feet of water, and it showcases the cutting-edge technology that allowed them to investigate the wreck of U-869. Finally, Hitlers Lost Sub discusses the history of the Nazi submarine fleet and the role that these ships played during the war. After an early version of the film aired in Germany, a 78-year-old survivor of the U-869 disaster came forward; his incredible story is included in the final film. ~ Sarah Welsh, All Movie Guide