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Commander of a US submarine sighting through a periscope during exercises at the Submarine Base, New London, Groton, Connecticut, United States, Aug 1943; either aboard Mackerel, Marlin, or Snook.

Nautilus and Seawolf - first two nuclear subs side by side at the Submarine Base Groton CT 1955. The Seawolf had a unique cooling system for the nuclear reactor - liquid sodium; water on other nuc subs. Bad thing is - Liquid sodium is very volatile when mixed with water - subs operate in a lot of water; what genius thought this was a good idea?