This is as much a batmobile of yachts as I can think of
It’s one of Roman Abromavitchs creations, called Ecstasea (punny). That is a HUGE jet-powered pumpjet. Specifically, the GE LM2500 marine gas turbine. It’s roughly 31,000 hp and a marine version of the engine on the C-5 Galaxy, the CF-6 or TF39. The yacht already had 4 diesel engines of 3100 hp each hooked up to high-speed shafts and props. With just the oil burners it will do 25 knots. If you REALLY need to be first in line at Monaco harbor then you fire up the turbine and pick up an extra 5 knots (and lose a lot of fuel weight).
It shoots it out the back like a jet engine that uses water...cause it is. It’s great.
Its pretty fancy, it even has its own helicopter garage
oh, it also eats bridge booths in its spare time.
Of course, after a few years, he got bored with it and dropped it for a newer hotter yacht.