Bunker Valentin stands on the Weser River in Rekum, a suburb of Bremen, Germany. It was built to produce and launch German U-boats during World War II, and it was the largest fortified U-boat facility in Germany, second only to Brest in France. Construction ran from February 1943 to March 1945, and the bunker was never finished. The Organisation Todt oversaw the work.
The structure used about 500,000 cubic meters of concrete. It is roughly 426 meters long and 97 meters wide at its widest point, with walls 4.5 meters thick. An estimated 10,000 to 12,000 people built it, most of them forced laborers held in camps nearby.
The RAF struck the roof with two Grand Slam bombs on March 27, 1945. The German Navy used the bunker as a depot from 1960. Today a museum and memorial runs it, and entry is free.
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