In the film “Greyhound”, at a few points the German u-boat captain gets on the US destroyer’s loudspeaker and taunts the allied sailors. Is this realistic? Are there cases where German (or other) naval personnel gained access to enemy ships’ communications in this way?
Anyone with further insight on the matter is welcome to contribute if they're capable, so don't take this post as discouraging such.
As it happens, that particular aspect of Greyhound has come up before. u/thefourthmaninaboat looks at just how likely the prospect is.