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.

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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 structures were built to to protect Germany’s submarine fleet from aerial attack while refuelling, refitting or repairing.

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 factory was under construction from 1943 to March 1945 using forced labour, but was damaged by air-raids before U-boat production could begin.

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 · In April of 1941, laborers began building the concrete behemoths in La Rochelle's harbor. The massive pens were to hold the "Unterseeboots," one of Germany 's most formidable weapons during World...

Apr 10, 2023 · However, to increase U-boat production, it needed a bomb-proof space. Construction of the Valentin pen began just as the conflict turned out of favor for Germany. While it never saw completion, it proved that reinforced concrete could be a force against aerial attacks.

Aug 14, 2019 · It could be a scene from any of the myriad ports along the 2,130 miles of French coastline but for several incongruous intruders on Lorient’s Keroman Peninsula: three enormous concrete U-boat bunkers, built by the Germans as a base for submarine attacks on Allied shipping in the North Atlantic.

Jul 20, 2022 · During WWI and WWII, the Germans knew they can’t be complacent about defense, so they built what would become one of the war’s most famous concrete construction works and one of the most demanding...

Nov 10, 2023 · The Valentin Submarine Pens, constructed during World War II near Bremen, Germany, were one of the largest and most fortified U-boat facilities of the era. These massive pens, with walls and a roof made of heavily reinforced concrete, were intended to endure even the most severe Allied bombardments.