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High Quality Content by WIKIPEDIA articles! A submarine pen is a bunker to protect moored submarines from air attack. German World War II U-boat pens in France included Saint-Nazaire, Lorient, La Rochelle and Toulon. In Norway, DORA 1 was a large pen in Trondheim, Norway. U-boat pens protecting construction of the German Type XXI submarine were located at Hamburg (Blohm & Voss), Bremen (AG Weser), and Danzig (F. Schichau). The Finkenwerder U-boat pens were constructed by 1,700 slave labourers over 4 years, and after being captured, were demolished with 32 tonnes of bombs. U-boat facilities became a bombing priority first in March 1941 and again during the Combined Bomber Offensive, and U-boat yards and pens were the primary objectives for the Eighth Air Force from late 1942 though early 1943. Operation Aphrodite guided aircraft, BATTY guided bombs, Disney rocket-boosted bombs, Tallboy bombs and Grand Slam bombs were subsequently used to attack the U-boat pens.