PORTICELLO, Sicily (AP) — Police divers resumed searching Tuesday for six people believed trapped in the hull of a superyacht that sank in deep seas off Sicily, including British tech magnate Mike Lynch, who was celebrating his recent acquittal on fraud charges with the people who had defended him at trial. The luxury sailboat, off Porticello near Palermo, was about 50 meters (164 feet) underwater — far deeper than most recreational divers are certified for and a depth that requires special precautions. Recovery crews could only stay for 12-minute shifts, a measure that slowed efforts to reach the cramped inside of the wreck.

Divers tag-teamed the shifts and were using a remote-controlled underwater vehicle, or ROV, to help in the search. They hadn't been able to access the below-deck cabins because they were blocked by furniture that shifted during the violent storm that struck the vessel early Monday. Rescue crews said they assume the missing six are in those cabins because the storm struck when most would be sleeping, but the teams haven’t verified their presence there through portholes.

The Bayesian, a 56-meter (184-foot) British-flagged yacht, was moored about a kilometer (a half-mile) offshore when a storm rolled in before 4 a.m. Monday.

Civil protection officials said they believed the ship was struck by a tornado over the water, known as a waterspout, and sank quickly . Grainy film from closed-circuit cameras from shore, broadcast on the website of the Giornale .