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
Saint-Nazaire submarine base
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The submarine base of Saint-Nazaire is one of five large fortified U-boat pens built by Germany during the Second World War in occupied Saint-Nazaire, France.
Saint-Nazaire submarine base, April 1942
Rommel inspecting the base, 18 February 1944
U-455 at Saint-Nazaire
Roof of the base and radome