Finally found where all the sounds get 'rendered' in the game code. This allowed me to see what sounds were enabled when you sit at the hydrostation. The ambient noise for the hydrostation is enabled AND the ambient noise for the torpedo room is enabled

Why ambient noise for torpedo room? You have headphones on and the only sounds you will hear are the hydrophone ambient. I always wondered what that other noise was in the background of the hydrostation's ambient. Now it's time to disable that noise