Submarine base
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A submarine base is a military base that shelters submarines and their personnel. Examples of present-day submarine bases include HMNB Clyde, Île Longue, Naval Submarine Base Kings Bay, Naval Submarin
Holland Torpedo Boat Station Plaque stating New Suffolk, New York's claim to be the first submarine base.
HMNB Clyde
Naval Station Pearl Harbor
Naval Base Guam
Submarine pen
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A submarine pen is a type of submarine base that acts as a bunker to protect submarines from air attack.
Surrendered German U-boats moored outside the Dora I bunker in Trondheim, Norway, May 1945
Forced workers at the construction site of the Valentin submarine pens in Bremen, 1944
Bordeaux U-boat pens
Brest U-boat pens