Bob Murphy,
“Remember the British torpedoing the heavy Argentine cruise Admiral Belgrano from 70 miles away during the Falklands War?”

That wasn’t from 70 miles away. It was from within “normal” torpedo range. I don’t believe that we have torpedoes with that kind of range (I think the Russians do) but even if you did you wouldn’t want to use them in this type of scenario because it is extremely difficult for the sub to positively identify a target from that far away, without also giving it’s own location and identity away.