Nazi War Machines: Secrets Uncovered (2019)

S01E03 The U-Boats

Title: The U-Boats Plot: James plunges into the treacherous world of Germany's Wolf Packs, the U-boats that posed the greatest danger to Britain during wartime. He explores everything from the perilous one-man torpedoes to the revolutionary Type XXI submarine, which had the potential to alter the course of naval warfare.