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i have not seen any submarines with flags though.

• dmoy 1y ago
  I think GP means flag as in flag state - ocean vessels are typically to some country. In this sense, nearly all submarines are flagged - US navy, Russian navy, whatever. Not as in a literal flag flying on the submarine. (Though they do fly flags near ports and such)
  • AngryData 1y ago
    Their is an entire DIY submarine community around the Caribbean and those guys aren't part of any navy or military and don't fly flags.