[UnderseaLcpl]

This game needs the "torpedo is a dud, sir" message SHIV has.
There are many records of subs on both sides firing duds and the crew didn't even need the hydrophones to hear them, such was the clang it produced.

Thanks for the wooden rifles, Torpedo Inspectorate.

BTW ddiplock if they never knew you were there they either missed or ran too deep(most likely)
A dud will still alert them to attack.