Rome — Six people, including two U.S. nationals, a British technology entrepreneur and one of his daughters, were still missing Tuesday after a large luxury sailing yacht sank off the coast of the southern Italian island of Sicily during a violent storm. The 184-foot Bayesian had been anchored about half a mile off the port of Porticello, near Palermo, with 22 people on board — 10 crew members and 12 passengers.

The vessel sank at about 5 a.m. local time (11 p.m. Eastern, Sunday) after being hit by a possible waterspout spawned by the storm. Italian media said the winds snapped the boat’s single mast, unbalancing the vessel and causing it to capsize.

Fifteen of those on board managed to escape the yacht and were rescued by a Dutch-flagged vessel that was anchored in the immediate vicinity. They were brought ashore by Italian Coast Guard and firefighters.

One body — an unidentified male — was recovered, but six people remained missing, including British software magnate Mike Lynch, once described as Britain’s Bill Gates. 

Lynch was acquitted in June of fraud charges in the U.S. that could have landed him with a decades-long prison sentence. In an unusual twist, Lynch’s co-defendant in that fraud case, who was also acquitted, died Saturday after being hit by a car while out jogging in England.

Lynch’s teenage daughter Hannah was also among those missing, along with Lynch’s American lawyer Chris Morvillo, a former assistant district attorney in New York, and his wife Neda. British banker Jonathan Bloomer, chairman of Morgan Stanley International, was also still missing Tuesday.

Among the survivors was a 1-year-old British girl who was being treated at a nearby hospital along with her parents. They were doing well, according to Italian media.

“For two seconds I lost my child to the sea, then I immediately was able to grab her again in the fury of the waves,” the girl’s mother, identified only as Charlotte, was quoted as saying by Italy’s ANSA news agency. “I held on to her tightly in the stormy sea. Many were screaming. Luckily the life raft opened up and 11 of us managed to get aboard.”

“It was terrible,” she told ANSA. “In just a few minutes the boat was hit by a very strong wind, and sunk soon thereafter.”

Karsten Borner, the captain of the Dutch vessel that came to the rescue, told ANSA he had been anchored near the Bayesian.

“When the storm was over we noticed that the ship behind us was gone, and then we saw a red flare, so my first mate and I went to the position and we found this life raft drifting, and in the life raft was also a little baby and the wife of the owner.”

Recovery efforts were back underway Tuesday, with speedboats, helicopters and divers continuing to search for the missing — as well as for answers, as to how a state-of-the-art superyacht could disappear in a flash. 

According to Italian media, Fire Brigade divers reached the boat and saw bodies trapped inside some of the cabins, but they had been unable to recover any of the victims from inside the vessel by Tuesday, due to obstructions. The Bayesian appeared to have sunk in an area with a depth of about 160 feet.

Witnesses said the boat sank quickly. 

“I was at home when the tornado hit,” fisherman Pietro Asciutto told a local news outlet. “I immediately closed all the windows. Then I saw the boat, it had only one mast, it was very large. I suddenly saw it sink… The boat was still floating, then suddenly it disappeared. I saw it sink with my own eyes.”

The director-general of Sicily’s civil protection agency, Salvatore Cocina, confirmed to CBS News partner BBC News that three of the six people still missing Monday were British tech entrepreneur Mike Lynch, whose company Autonomy Corporation PLC was acquired in 2011 by HP; one of his daughters, Hannah Lynch, who is believed to be 18; and the boat’s chef, Ricardo Thomas.

CBS News has seen corporate documentation showing a company called Revtom, solely owned by Lynch’s wife Angela Bacares, who was among those rescued from the accident, as the owner of the yacht that capsized off Sicily. 

While the yacht was a privately owned pleasure boat, the waters around the island have claimed many lives over the last decade.

Dozens of migrants have died attempting to reach Sicily and smaller Italian islands in the region. Sicily sits only about 100 miles from the east coast of Tunisia in north Africa, and the Mediterranean crossing has been a frequent site of both nautical rescues and disasters as smugglers routinely send small boats overloaded with desperate people into the sea.

CBS News’ Chris Livesay in Rome and Joanne Stocker in London contributed to this report.

contributed to this report.