PORTICELLO (Italy), Aug 23 — Italian emergency services resumed their search on Friday for the body of Mike Lynch’s 18-year-old daughter, the only person still unaccounted for since the British tech magnate’s family yacht sank off Sicily this week, killing him and six others.

The British-flagged Bayesian, a 56-metre-long superyacht carrying 22 passengers and crew, was anchored off the port of Porticello, near Palermo, when it capsized and sank on Monday within minutes of being struck by a pre-dawn storm.

Lynch’s daughter, Hannah, is presumed to be the seventh victim of the shipwreck. An interior ministry official said on Thursday her body might not be inside the yacht and could have been swept out to sea.

A judicial investigation has been opened into the sinking, which has baffled naval marine experts, who say a boat like the Bayesian, built by Italian high-end yacht manufacturer Perini, should have withstood the storm.

The CEO of The Italian Sea Group, which owns Perini, told Reuters the shipwreck was the result of a string of “indescribable, unreasonable errors” made by the crew, and ruled out any design or construction failings.

Pulling the wreck out of the sea, where it is now lying on its right side, apparently intact, at a depth of about 50 metres, may help investigators determine what happened to it, but the operation is likely to be complex and costly.

Nick Sloane, the South African engineer who led the operation to salvage the Costa Concordia cruise liner that sank in 2012, said in Italian media interviews on Friday that the operation would cost up to 15 million euros (RM73 million).

He told La Repubblica newspaper the yacht’s salvage would have to be completed by mid-October, and take six to eight weeks, including preparation work. Bringing the yacht to the surface will have to be done “very, very slowly”, and might take a couple of days, he said. — Reuters