Submarine pen
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A submarine pen is a type of submarine base that acts as a bunker to protect submarines from air attack.
Surrendered German U-boats moored outside the Dora I bunker in Trondheim, Norway, May 1945
Forced workers at the construction site of the Valentin submarine pens in Bremen, 1944
Bordeaux U-boat pens
Brest U-boat pens
Valentin submarine pens
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The Valentin submarine factory is a protective shelter on the Weser River at the Bremen suburb of Rekum, built to produce and launch German U-boats during World War II. Built between 1943 and March 19
Submarine pen
…The "Hornisse" bunker was not started until 1944 in Bremen; it was never completed. "Valentin" was the largest bunker in Germany. Begun in 1943, it was built to be a manufacturing facility, where Type XXI submarines were to be constructed. It…
Aerial view of Valentin (2012), with modern solar panels at right
With the walls complete
One of the roof trusses is lifted into place
The partially completed Valentin bunker in 1944 and some of the workforce of forced labourers