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Island of Vis in Croatia has one, legacy of Yugoslavia, you can swim in. It's a fun experience.

• _nalply 6y ago
  Where exactly?
  • martijnjs 6y ago
    43.07809 16.18140
  • mikeyouse 6y ago
    Got curious and went looking, this looks like the one: Ex. Yugoslavian military shelter for submarines D117, 21480, Rogačić, Croatia https://goo.gl/maps/imWgUufegJoe1ZsGA https://goo.gl/maps/imWgUufegJoe1ZsGA
    • Keyframe 6y ago
      That's the one. Island is relatively small and has interesting military installations on it.
    • t0mislav 6y ago
      Correct! I have been there.
• cjg_ 6y ago
  There's a quite big one in Sweden also, built in the 50's that is still active. https://en.wikipedia.org/wiki/Musk%C3%B6_naval_base https://en.wikipedia.org/wiki/Musk%C3%B6_naval_base