In a quest for world domination, the Nazis built some of the biggest and deadliest pieces of military hardware and malevolent technology in history. The series, Nazi Mega Weapons, tells the story of Germany’s engagement in World War II from a unique perspective, uncovering the engineering secrets of iconic megastructures, telling the stories of the engineers who designed them and revealing how these structures sparked a technological revolution that changed warfare forever.

By early 1943 Nazi Germany is losing the battle in the Atlantic. Their U-Boat menace is no longer invulnerable to attack; it could cost them the war. But Hitler and Kriegsmarine High Command are one step ahead. Since 1940, they’ve been planning a submarine capable of fast underwater speeds and phenomenal firepower that will outperform anything that has gone before. Designated the Type 21, it’s the world’s most advanced submarine: Hitler’s sea-faring super weapon.