Imposing Concrete Hideout is Where Nazi U-Boats Were Once Built ⛴ WWII by Drone | Smithsonian // TRAIN BRAIN

Imposing Concrete Hideout is Where Nazi U-Boats Were Once Built ⛴ WWII 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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