On: The Many Methods of Communicating with Submarines

[hchz]

You can actually hear some forms of Gertrude through the hull!

I slept with my head right near the hull, and when we did a certain kind of op where it was in use, you could faintly hear what sounded like a home modem.

[kayfox → hchz]

You can hear it in the movie The Abyss as well, since Cameron is a stickler for accuracy.