Keroman Submarine Base was a German U-boat base located in Lorient during World War II. Grossadmiral Karl Dönitz decided to construct the base on 28 June 1940. Between February 1941 and January 1942 three gigantic reinforced concrete structures were built on the Keroman peninsula. They are called K1, K2 and K3. In 1944 work began on a fourth structure. The base was capable of sheltering thirty submarines under cover. Although Lorient was heavily damaged by Allied bombing raids, this naval base survived through to the end of the war. Lorient was held until May 1945 by the Nazi German army, even though this city was surrounded by the American Army, since the Germans there refused to surrender.
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