Italian prosecutors have opened a manslaughter investigation into the sinking of Mike Lynch’s family superyacht Bayesian off the coast of Sicily on Monday.

The Termini Imerese Public Prosecutor’s Office, headed by Ambrogio Cartosio, announced the investigation and said it was not aimed at any specific person.

The news comes a day after the body of Mike Lynch’s 18-year-old daughter Hannah was recovered from the shipwreck site.

She was the last person to remain missing after the tragedy. The bodies of Mr Lynch and four others were recovered by divers on Thursday.

Officials could not confirm the identities of the other bodies recovered from the water.

Others reported missing from the yacht include Morgan Stanley International chairman Jonathan Bloomer, Bloomer’s wife Judy, Clifford Chance attorney Chris Morvillo and his wife, Neda Morvillo.

The body of the only deceased crew member on board, chef Recaldo Thomas, was found on Monday.

Fifteen of the 22 people on board survived the sinking, including Lynch’s wife, whose company owned the Bayesian ship, and the yacht’s captain.

Angela Bacares, Charlotte Golunski and her one-year-old daughter Sofia also survived.

The shipbuilder has since attributed the sinking to “indescribable, unreasonable mistakes” by the crew.

Giovanni Costantino, CEO of Italy’s Sea Group, the superyacht’s manufacturer, said there were no structural problems with the ship that could have caused the sinking, but said the crew was ill-prepared.

“There were absolutely no problems, it was an example to many other ships because it was so stable,” he told the BBC.

“The weather alarms clearly showed that the storm would arrive at 4am, the captain should have closed all the hatches, weighed anchor, sailed into the wind and lowered the keel. Then everyone could have gone back to sleep and the cruise would have continued happily.”

Mr Costantino told Reuters that proper emergency procedures had not been followed despite stormy weather being forecast.

“The boat made a series of indescribable, unreasonable mistakes, the impossible happened on that boat… but it sank because it took on water. From where, the investigators will say.”

The Bayesian, a 56-metre British-flagged yacht, sank in a storm on Monday morning while moored about a kilometre off the coast.

According to civil protection authorities, the ship was probably hit by a tornado on the water, a so-called waterspout, and sank quickly.

Another yacht anchored near the Bayesian escaped unharmed.

ABC/Wires