Do they not launch torpedos underwater anymore?

Except for on submarines, where there isn’t a deck, deck-launched torpedoes have been normal for about as long as torpedoes have been used. It’s much more of a nuisance to do things underwater than above the surface, so unless you’ve got a good reason, like being a submarine, generally we don’t.

Does any benefit at all remain? What about stealth if they somehow have some kind of radar thing?