Not true.. 819 squadron at HMS Gannet saw to that. I vaguely recall when I was a baby tiff on field training in 1988 an exercise Stingray accidentally stoofing into the side of a boat, I think it was the Conqueror (Someone correct me if I am wrong) The boat in question limped into Faslane much to amusement of the TV News crews and acute embarrassment of the Roger Nigel.
Interesting story, worth a look up when the 30 years rule runs out on that one. The one I was talking about the weapons involve were a mix of DC's, AS-12 Missiles and a Mk 46, all warshots lobbed at a certain Argie sub in late April 82 by every other Westland product in operational shipborne FAA use at the time. Though somebody did say on one of the Falklands threads on here, that a Mk 46 was launched against a confirmed twin screw sub target during the war and the sub evaded the torpedo. Didn't say what the 46 came off though.