Nazi Megastructures: U-Boat Base

In the quest for world domination, the Nazis built some of the biggest and deadliest pieces of military hardware and malevolent technology in history. Over six episodes, this series uncovers the hidden remains of Hitler's most ambitious megastructures, telling the stories of the engineers who designed them and revealing how these structures sparked a technological revolution that changed warfare for ever. In this programme, discover how the Nazis built massive, impenetrable submarine pens, which still survive to this day, in order to create a safe haven in port for their lethal U-boats