World War I: Dunno really
Inter-war: U.S. S-boats
World War II: German Type XXI
Cold War:
Soviet Project 705 Lira class NATO code: Alfa (not Alpha)
American Sturgeon class (especially variant USS Narwhal, SSN-671)
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You talk to God, you're religious. God talks to you, you're psychotic. - Dr. House
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