From the Smithsonian Channel

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

Name: This Imposing Concrete Hideout is Where Nazi U-Boats Were Once Built
Uploaded: 2024-06-05
Duration: 245779
Description: 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.

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.

Smithsonian magazine | 4:05