Saloon doors may've opened -- design flaw.
First thing to learn is if the yacht’s retractable keel was in the down position. If not, the vessel would could much more easily be knocked over or capsized by sudden high winds. Second thing are the status of two “doors” built into the hull, one aft to access the tender boat bay, the other an observation platform on one of the sides. Both, normally, are closed up at night.
A naval architect reported Perini Navi sister vessel has enormous sliding glass doors designed to keep the ocean out, even in flooding from a capsize. Unless locked or bolted, however, the doors will slide open when the yacht heels over. The guy said the wind knocked the boat over and water just poured in and below decks. For all on board, trying to evacuate a suddenly capsized and sinking yacht in the dark, must have been a terrifying and living nightmare.