Tweet Facebook Mail Italian police divers continued to search for six people trapped in the hull of the Mike Lynch superyacht off Sicily amid questions about why the vessel sank. The Bayesian , a 56-metre British-flagged yacht, was moored about a kilometre offshore when a storm rolled in during the early hours of Monday. Civil protection officials said they believed the ship was struck by a tornado over the water, known as a waterspout, and sank quickly.

The luxury vessel, off Porticello near Palermo, is resting 50m 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. READ MORE: Court upholds conviction of former secretary at Nazi concentration camp, age 99 Scuba divers arrive at the harbour of Porticello, southern Italy, .

Rescue teams and divers returned to the site of a storm-sunken superyacht to search for six people, including British tech magnate Mike Lynch, who are believed to be still trapped in the hull. (AP Photo/Salvatore Cavalli) (AP) Italian authorities said they assume the missing six are in the yacht's cabins because the storm struck when most would be sleeping, but the teams haven't verified their presence there through portholes. Accompanying the rescue effort are theories about why the yacht owned by Lynch, a technology magnate, sank so rapidly.

Grainy film from clos.