An interim report into the disaster also found that “vulnerabilities” were “unknown to either the owner or the crew of Bayesian” as they were not included in the stability information book carried on board.
Billionaire entrepreneur Mr Lynch, 59, and his daughter Hannah, 18, were among seven people who died when the 56-metre vessel sank off the coast of Sicily on 19 August 2024.
The vessel was in a “motoring condition” with its sails lowered and the centreboard — which is used to help stabilise it — was in a “raised” position, the report said.
The others who died in the sinking were US lawyer Chris Morvillo and his wife Neda Morvillo, and Canadian-Antiguan national Recaldo Thomas, who was working as a chef on the vessel.
An undated photo provided by the Lynch family, showing Mike and Hannah Lynch (Photo: Lynch family, via AP)
The MAIB report stated that during the previous day, the Bayesian was sailed to the site where it later sank in order to “shelter” from forecast thunderstorms.
Some 55 minutes later the deck hand posted a video of the advancing storm on social media, then went onto the deck to close windows to protect the interior from rain.
At 4.06am local time, wind speeds exceeded 70 knots (80.6mph), “violently” knocking the vessel over to a 90-degree angle in under 15 seconds, investigators said, and “people, furniture and loose items fell across the deck”.
Several crew members were working in response to the conditions when the vessel was knocked over.
The skipper instructed guests and crew on an area of the deck to “swim clear of the mast and boom as the vessel was sinking”.
They went on to be rescued on a small boat dispatched by yacht Sir Robert Baden Powell, which was also at anchor nearby.
The Bayesian may have had a vulnerability to high winds (Photo: Yacht Charter Fleet/ www.yachtcharterfleet.com/luxury-charter-yacht-22774/bayesian-photos.htm)Simon Graves, an MAIB investigator, told the PA news agency: “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.
Mr Graves said the stability information book did not “consider the effects of wind” because the sails were not raised and the vessel was “running on its engine” before the sinking.
Andrew Moll, chief inspector of marine accidents, said: “The findings indicate that the extreme wind experienced by Bayesian was sufficient to knock the yacht over.
“The results will be refined as the investigation proceeds, and more information becomes available.”
No date has been set for when the final report will be published.
The boat trip was a celebration of his acquittal in the case in the US.
With agencies
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