In 1991, a group of recreational divers exploring the waters off the coast of New Jersey made a shocking discovery, an unidentified World War II-era submarine lying 230 feet beneath the surface. It had no visible markings and no known reason to be there. Over the next several years, they uncovered its identity: U-869, a Nazi German U-boat that had supposedly been sunk near Gibraltar. But the real story was far more disturbing, and far closer to home. What they found inside the wreck challenged decades of military history and raised serious questions about what U-869 was doing off the American coast. From forgotten war records to sealed compartments and chilling Nazi artifacts, this is the untold true story of a submarine lost in time. What salvage divers found inside the sunken Nazi Germany submarine will leave you speechless. Watch the full investigation unfold.