In summer 2008, a mysterious submarine was discovered off the coast of Italy at 120 meters deep. For Lorenzo del Veneziano, an underwater marine archeologist, it was an amazing sight, as the submarine was intact! Standing almost vertically at the bottom of the sea, its hull stuck in the sediment. What is the story of this ship, why is it there? During World War II, 60 German U-boats sailed in the Mediterranean Sea. All were found but one. Could this be the wreck of the long lost U-455, the last missing German U-boat? Retrace the incredible story of U-455, a German warship that fought every marine battle against the Allies, from the Baltic Sea, to the Atlantic and then finally the Mediterranean where it now rests.