A submarine pen (U-Boot-Bunker in German) is a type of submarine base that acts as a bunker to protect submarines from air attack. The term is generally applied to submarine bases …

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.

Feb 8, 2017 · By 1942 the pens could hold 13 U-boats. With a complicated series of locks, underwater pens could be drained, and the submarines hauled up by crane to workshops. Due …

Mar 31, 2021 · The submarine pens built in WWII were some of the biggest concrete construction works of the war, and some of toughest targets throughout all of Europe. These immense …

The Valentin submarine factory is a protective shelter on the Weser River at the Bremen suburb of Rekum [de; nds], built to produce and launch German U-boats during World War II. The …

Apr 10, 2023 · Like other U-boat pens, Valentin was designed to protect the submersibles from air raids. It served another function, as well, which made it unique when compared to similar …

Jul 20, 2022 · These impressive structures were constructed to protect the Nazi submarine fleet from aerial attacks during their refueling, refitting, or repairing, and they were almost …

Saint-Nazaire’s submarine base is one of five bases that the Nazis constructed along the Atlantic front during World War Two. This 301m-long strategic base was built in just 16 months in 1941 …

Mar 22, 2021 · The harbour at Saint-Nazaire was identified for the construction of a large submarine base to service and re-arm U-Boats (Unterseeboots), in their campaign to sink …

The massive concrete submarine pens were constructed at St. Nazaire, Brest, Lorient, La Pallice, and Bordeaux in France, and the ports of Bergen and Trondheim in Norway. Built by the …