The sinking has puzzled naval marine experts who say a boat like the Bayesian, built by Italian high-end yacht manufacturer Perini, should have withstood the storm and in any case should not have sunk as quickly as it did.

Pulling the Bayesian out of the sea will help investigators determine what happened, but the operation is likely to be complex and costly. The wreck is lying apparently intact on its side at a depth of 50 metres (164 feet).“It’s in the interests of the owners and managers of the ship to salvage it,” Cartosio said, adding “they have assured their full cooperation”.

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

Raffaele Macauda, deputy commander of the Palermo coastguard, said there was no alert of a tornado at the time of the sinking on Monday morning.

Mr Macauda told a press conference: “Given that the conditions were such, there wasn’t anything to suggest there could be an extreme situation arising.

“There are vessels that can monitor, after all, these events and one would have thought that the captain had taken precautions.”

Deputy Prosecutor Raffaele Cammarano told journalists the Italian Air Force had confirmed the sinking was most likely caused by a downburst which are powerful winds that descend from a thunderstorm and spread out quickly once they hit the ground.

Officials will look into the safety equipment on the sunken vessel.

Mr Cammarano was asked about whether there is a black box and if the hatches were left open.

He said investigators do not have exact information about the black box and that the first phase of the inquiry will look into it.

The captain James Cutfield and the other survivors have been questioned this week by authorities. None of them have commented publicly on how the ship went down.

Raffaele Cammarano, another prosecutor speaking at the same news conference, said that when authorities questioned Cutfield he had been “extremely cooperative”.

Hannah Lynch’s sister Esme described her as “the most amazing, supportive and joyful sister”.

Paying tribute, she said: “Hannah often burst into my bedroom and lay down with me. Sometimes beaming with a smile, sometimes cheeky, sometimes for advice. No matter what, she brought boundless love to me.

“She was endlessly caring, passionately mad, unintentionally hilarious and the most amazing, supportive and joyful sister and best friend to me.

“And on top of all this, she had even more love to give endlessly to all her friends, and passion to give to her incredible studies and goals.

“She is my little angel, my star.”

A spokesperson for the Lynch family said: “The Lynch family is devastated, in shock and is being comforted and supported by family and friends.

“Their thoughts are with everyone affected by the tragedy.

“They would like to sincerely thank the Italian coastguard, emergency services and all those who helped in the rescue.

“Their one request now is that their privacy be respected at this time of unspeakable grief.”

A diver described the emotional moment the final body was pulled from the wreckage of the Bayesian when they all stopped to applaud as Hannah Lynch made it to shore.

Inspector Vincenzo Nardoni, a diver drafted in from the fire brigade’s unit in Naples, said: “It was an emotional liberation, a relief of stress.

“Because stress is our daily bread. We work on call and in emergencies, and we intervene immediately. So stress is our baggage, is what we bring with us.”

He added “We had to revise the scene from a different angle from the way we’d normally see it, and that made everything more difficult.’

“We entered the confined spaces, having already performed evaluations on the safe point to enter inside the yacht. We found the safest spot and got inside from there.

“But inside it was a very confusing place, with wardrobes and furniture whirling all around us, and lots of mirrors reflecting back our lights at us.

“The bodies were all wedged in tight spots, with furniture on top or beside them. They were all stuck there.”

Chief prosecutor of Termini Imerese, Ambrogio Cartosio, said his office has opened an initial investigation into manslaughter and negligent shipwreck at a press conference.

Asked whether the crew will remain in Sicily, Mr Cartosio said: “There’s no obligation, but they should be available for the investigation.”

Authroties still have questions to ask the captain but that they cannot keep people in the country under Italian law.

Raffaele Cammarano added his officials were going to give the crew alcohol and drug testing.

He stressed no individuals were yet under investigation.

British tech tycoon Mike Lynch was among seven people who died after the luxury superyacht Bayesian sank off the coast of Sicily early on Monday morning

The 59-year-old is known for founding Invoke Capital and Autonomy Corporation and had been in the headlines after he was cleared of charges in a high-profile fraud case.

But how did the “British Bill Gates” earn his fortune?

The final moments of the remaining victims of the Bayesian disaster have been revealed in a press conference earlier today.

Local prosecutor Raffaele Cammarano said the meteorological event that hit the vessel was most likely a “downburst”, a very strong downward wind that is an intense but relatively frequent event at sea, rather than a water spout which involves rotating winds like a whirlwind or tornado.

He said that the passengers were all probably asleep at the time of the storm which was why they failed to escape.

Bentivoglio Fiandra, chief of Palermo’s fire brigade and part of the divers’ rescue team, explained that the Bayesian sank stern-first and then rolled onto its right side.

“As a result, the victims sought refuge on the left side of the boat, where the last air pockets remained as the vessel was sinking,” he said.

The divers found five bodies in the first cabin on the left and one, Hannah Lynch’s, in the third cabin on the left.

The sinking has puzzled naval marine experts who say a boat like the Bayesian, built by Italian high-end yacht manufacturer Perini, should have withstood the storm and in any case should not have sunk as quickly as it did.

Inspector Vincenzo Nardoni, a diver drafted in from the fire brigade’s unit in Naples: “The bodies were all wedged in tight spots, with furniture on top or beside them. They were all stuck there.”

According to the Telegraph, Raffaele Cammarano, one of two prosecutors leading the case, told a press conference earlier: “There can be no certainty about the behaviour of the passengers on board, at the moment.

“It is probable they tried to escape but we have no real details about that, that will emerge in the course of the inquiry.”

Italian public prosecutor Ambrogio Cartosio, from nearby town Termini Imerese, said his office has opened an initial investigation into manslaughter and negligent shipwreck. No specific suspects have been named.

My colleague Jabed Ahmed reports: