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In an interim report on the disaster, Britain's Marine Accident Investigation Branch said the boat was “vulnerable� to winds that were even lighter than the ones that tipped it over. The report was based on “a limited amount of verified evidence� as a criminal investigation by Italian authorities has restricted its access to the wreck and other pieces of evidence, it said.

The agency, which is investigating the disaster because the Bayesian was registered in the U.K, said the “vulnerabilities� were “unknown to either the owner or the crew,� as they were not included in the stability information book carried on board.

The report stated that the Bayesian was sailed to the site where it sank the day before in order to “shelter� from forecast thunderstorms. It said the disaster occurred at 4:06 a.m. local time, when wind speeds exceeded 70 knots (81 mph.), “violently� knocking the vessel over to a 90-degree angle in under 15 seconds,

It said that at the time of the incident, the vessel was in a “motoring condition� with its sails lowered, while the centerboard, which is used to help stabilize it, was in a “raised� position.

“You have the wind pushing the vessel over and then you have the stability of the vessel trying to push the vessel back up right again," said Simon Graves, an MAIB investigator. “And what our studies found was that they show that the Bayesian may have been vulnerable to high winds and that these winds were likely to have been evident at the time of the accident.�

Inquest proceedings in the U.K. are looking at the deaths of Lynch and his daughter, as well as Morgan Stanley International bank chairman Jonathan Bloomer, 70, and his wife, Judy Bloomer, 71, who were all British nationals.

The others who died in the sinking were U.S. lawyer Chris Morvillo and his wife Neda Morvillo, and Canadian-Antiguan national Recaldo Thomas, who was working as a chef on the vessel.

Fifteen people, including Lynch’s wife, Angela Bacares, were rescued.

A project to move the Bayesian into an upright position and lift it to the surface has been paused since May 9 when a diver died during underwater work. Recovery work is set to resume from Thursday.

Further details such as “escape routes� will be included in the final report, according to Graves.

“Once we get access to the vessel we’ll be able to tell a fuller picture of activities on board and the sequence of events," he said.

No date has been set for when the final report will be published.