Divers and an underwater drone have spent a second day searching for six people, including a British tech tycoon and international banker, believed trapped after a luxury yacht sank off the Italian island of Sicily.
The 56-metre yacht "Bayesian" was anchored with ten crew and 12 passengers on board when it was struck by a waterspout mini-tornado, early yesterday morning.
Fifteen people, including a woman and her one-year-old baby, were rescued.
The body of one man - reported to be the yacht's chef - was found.
Among the six missing are UK tech entrepreneur Mike Lynch and his 18-year-old daughter Hannah, and Jonathan Bloomer, chair of Morgan Stanley International, and his wife Judy.
The passengers were guests of Mr Lynch - sometimes referred to as Britain's Bill Gates - to celebrate his acquittal in a US fraud case.
While Italy's coastguard said the search continued without a break, Captain Vincenzo Zagarola said it was "difficult to imagine" it would end well.
Experts and officials have described the sinking as an "extroardinary" event.
The search was made difficult by the British-flagged yacht lying largely intact on the seabed some 50m down.
Divers take one minute to get down and another minute to get back. They are restricted to 12 minutes for each dive because of the water pressure, according to fire service spokesman Luca Cari.
Mr Lynch's wife Angela Bacares was among those rescued, according to head of Sicily's Civil Protection Agency Salvo Cocina.
As well as Mr Bloomer, who testified for Mr Lynch in the US case, the missing include the tycoon's lawyer Christopher Morvillo, and his wife Neda, according to legal firm Clifford Chance.
Mr Lynch, 59, was acquitted on all charges in a San Francisco court in June after he was accused of an $11 billion fraud linked to the sale of his software firm Autonomy to Hewlett-Packard.
A co-defendant, former Autonomy executive Stephen Chamberlain, died after being hit by a car in England on Saturday.
Mr Lynch's mother is from Co Tipperary and his father is from Co Cork.
CCTV footage shows the moment the waterspout moved through the area as it hit the superyacht
Divers trained to work in tight spaces have been flown in from Rome and Sardinia.
A first, nighttime search of the wreck failed, with firefighters saying that furniture was blocking their way.
Marco Tilotta, from the Palermo fire service divers' unit, said that search efforts were concentrated on getting inside the sleeping and living areas of the yacht.
"The spaces inside the boat are very tight and if you encounter an obstacle it is very complicated to move forward, just as it is very difficult to find alternative routes," Mr Cari said.
The vessel was moored off Porticello, east of Palermo, when violent winds and rains suddenly swept up the coast.
"It was terrible. The boat was hit by really strong wind, and shortly after it went down," survivor Charlotte Golunski told ANSA news agency.
Ms Golunski, board director at Luminance, a company founded by Mr Lynch, lost hold of her one-year-old daughter in the waves "for two seconds", before grabbing her again.
"Lots of people were screaming" in the dark, said Ms Golunski, who scrambled onto a life raft.
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Reportedly owned by Mr Lynch's family, "Bayesian" was built by Italian shipbuilding firm Perini Navi in 2008.
Its 75m mast was the world's tallest aluminium sailing mast, according to the Charter World website.
A photograph posted on social media by Baia Santa Nicolicchia bar in Porticello showed the yacht lit up, its towering mast shining in the darkness, just a few hours before the storm hit.
A waterspout is a column that descends from a cloud to form a rotating mixture of wind and water, often during severe thunderstorms.
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Matthew Schanck, from the Maritime Search and Rescue Council, said it was an "extraordinary event".
"This is a large, luxurious superyacht that has founded quite quickly in a touristy, well-known sailing area off Sicily. It's pretty unprecedented."
Karsten Borner, captain of a yacht anchored nearby at the time of the storm, said there was a "very strong hurricane gust" and he battled to keep his vessel steady.
Mr Borner saw the vessel's mast "bend and then snap", according to Italy's Corriere della Sera daily.
Italian authorities have opened an inquiry, while the UK's marine accident investigation branch sent four inspectors to the Sicilian capital Palermo.
