Italian rescuers brought ashore the body of the final missing person who was on a superyacht that sunk off the coast of Sicily.

The woman’s body was detected on Friday, the Coast Guard said. She has not been officially identified, but Hannah Lynch, the 18-year-old daughter of British tech magnate Mike Lynch, is reportedly unaccounted for. The Lynch family was aboard The Bayesian, a 56-meter (184-foot) British-flagged yacht, when went down in a storm early Monday.

Civil protection officials said they believe the ship was struck by a tornado over the water, known as a waterspout, and sank quickly.