Personally I believe all three events you spoke to in your OP are indeed related.
ETA: If this stuff (intelligence gathering with submersibles) intrigues you as it does me I highly recommend the book "Blind Man's Bluff: The Untold Story of American Submarine Espionage"
Blind Man's Bluff
Edited 1 time(s). Last edit at 03-Jul-19 01:13 by Who is John Galt.