If you like this kind of stuff checkout "Blind Man's Bluff: The Untold Story Of American Submarine Espionage"

There are so many fascinating details about submarine operations that are now unclassified (and makes you guess about what things are like that are still hidden). From communications to the underground listening stations to attempting (and succeeding) in wire-tapping soviet communication cables, to attempting to lift a wrecked foreign submarine right off the ocean floor.

It's an amazing read and very well written.