That was my first thought. It would be like hitting a moose doing 90 mph.
My first thought was about how a guided torpedo at those speeds means whatever you shoot at is dead with no recourse. Now a military submarine using the tech might be questionable since I cannot imagine this permits one iota of stealth (or detection outside the bubble for that matter).
Explosions underwater are already worse than in air due to the containment provided by the water. If you can lob a high supersonic torpedo at a carrier from range, it is dead - just plain, no bones about it dead. If you can get the range on such a torpedo up to maybe 100 miles or so, no surface vessel is safe.
This tech has very disturbing possibilities when it comes to the balance of sea power.
I don't think a moose can go that fast.