just took out a nelson, i was feeling impatient and used 9 torps.
in fairness it had stopped dead and was starting to sink abit after the first 2, but being in very shallow waters it didn't sink far before resting on the sea-bed in a upright position, i think this stopped the ship flooding at the normal rate.
nothing else for it, was going have to kill via hit-points. fired another 2, one was a dud, swung around a fired my stern fish. the ship was aflame.
then i got pestered by a couple of dd's, by the time i had sent them the wrong way (made them both get stuck on the beach heheheheh) all front my front torps had reloaded (~45mins). got into place, fired all 4 at 7m magnetic. all 4 blew under the centre of the ship. it split immediately.