What a MK-48 torpedo can do…
You have never seen footage where a single torpedo does damage like this.
It’s a US made (non nuclear) torpedo that is in use today by our
submarines. Very precise, very accurate and very powerful. This is the
Australian Submarine Navy doing a live torpedo practice shot on one of
their decommissioned ships. They used a MK-48 torpedo developed in the
  USA . It is not a contact weapon. It is designed to go off directly
underneath the ship at about 50 feet under the keel. The effect is
devastating as you can see from the video.