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 …

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 …

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 …

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. …

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 …

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 …

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 …