The body of British tech magnate Mike Lynch was recovered from the wreck of a superyacht that sank off the coast of Sicily, a source familiar with the matter told CNBC.

Rescuers were still searching for Lynch’s 18-year-old daughter Hannah, the source said, the last person missing from the luxury boat that went down in what authorities said was a freak storm early Monday.

A massive search effort was launched, and 4 bodies were recovered from the 180-foot Bayesian after an operation hampered by the depth to which the wreck had sunk and the debris that blocked divers’ path through its narrow passages.

Salvatore Cocina, head of Sicily’s civil protection agency, confirmed to NBC News on Thursday morning that a 5th body had been recovered. And hours later, CNBC reported that Lynch, regularly described in U.K. media as “Britain’s Bill Gates”, was one of them.

15 of the 22 people onboard the yacht survived.