the Mk-48 ADCAP torpedo is an amazing weopon...
it actually detonates below the enemy ships and vaporizes the water their. The ship is raised up from the force of the explosion and when it comes back down, there's no water there to support the keal....hence she is broken in half and goes to the bottom very quickly.
They have actually been in the fleet for many years, and it's still thee "top shelf" weapon. Not likely to be improved upon any time soon as the money isn't there to develop "cold war" weapons. They have actually never been fired in a hostile engagement.
There has only been one modern (nuclear) submarine torpedo engagement in a hot war, when the HMS Conqueror plugged the Argentine Cruiser General Belgrano during the Falkands war. Fortunately for the Argentines, the Brits shot a spread of ancient Mk 8 torpedoes and though some 300 were killed, they managed to abandon ship.
If they had used a modern torpedo, they certainly would have lost all hands.
There was a big stink about this sinking as the Belgrano was outside of the 200 mile 'cross this line and you're toast' zone the Brits had declared. The Conqureror was tracking the Belgrono steaming towards the Falklands, and reported in for instructions. None other than Maggie Thatcher (Mrs. Brass Balls herself) authorized the attack. Apparently the Belgrano had turned coarse and was heading away, but little did they know their fate was sealed.
I guess they played chicken with the wrong Prime Minister.