Dora I is a former German submarine base and submarine pen or bunker built in Trondheim, Norway. Construction of the bunker was undertaken during the Second World War. Nearby is the uncompleted Dora II. Trondheim was traditionally referred to as Drontheim in German, and the name DORA is the letter "D" in the German phonetic alphabet.
Dora I, a former submarine bunker
Construction of the bunker
Three U-boats in a submarine pen at Trondheim, 19 May 1945
German type VII and IX U-boats at Trondheim after the war on 19 May 1945
A submarine base is a military base that shelters submarines and their personnel.
Keroman III submarine pen, part of the former German submarine base in Lorient, Brittany.
Holland Torpedo Boat Station Plaque stating New Suffolk, New York's claim to be the first submarine base.
HMNB Clyde
Naval Station Pearl Harbor