The U.S.-flagged ships were blocked from a Spanish port after Spain reportedly said it would wave off vessels believed to be carrying military equipment for Israel.
Allegations of sexual assault on ships that ferry goods around the world have put the ocean shipping industry under a harsher spotlight, but many cases still fall into a prosecutorial void.
Divers found five of the remaining missing six passengers in one of the yacht’s cabins, the Italian Coast Guard said. Officials didn’t identify the bodies; one was described as a “stocky man.”