A Superyacht Submarine Debuts in Monaco

A surface speed of 9 knots and a submerged speed of 4 knots? This thing is hilariously slow. At 4 Knots, you could almost walk faster to any comparably distant terrestrial destination. The impracticality is obvious: taking the yacht away from any one sea or port to another (something you'd presumably want to do after spending tens of millions on a superyacht), would mean traveling for an absurdly, abnormally long time inside a sealed, limited space with no easy way to leave mid-journey.

At least normal surface yachts have reasonably decent top speeds of 20+ knots.

That's funny, my fantasy superyacht / submarine mashup lately has been of a submarine from which I could torpedo all the superyachts as they slink from port to port with their AIS transponders off.

What parts of the world have an undersea view interesting enough to make this worthwhile? Most of the places I can think of are not near where the super-rich like to hang out.

A good safety feature to deal with hurricanes?

Bad timing for the market, I suppose.