Imposing Concrete Hideout Where Nazi U-Boats Were Once Built ⚓ World War II by Drone | Smithsonian

Описание к видео Imposing Concrete Hideout Where Nazi U-Boats Were Once Built ⚓ World War II by Drone | Smithsonian

This imposing concrete structure in the German city of Bremen is 1400 feet long, 300 feet wide and 90 feet high, and looks every inch the secret Nazi facility that it is. Its purpose was to build and test U-Boats.

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