Italian prosecutors are investigating the captain of the superyacht that sank off the coast of Italy last week during severe weather.

James Cutfield, 51, from New Zealand, is under investigation for suspected manslaughter and culpable shipwreck, according to Italian media reports on Monday.

He and 15 others survived the sinking of the Bayesian. His daughter Hannah and five other passengers died.

“The Bayesian was built to go to sea in any weather,” Franco Romani, a nautical architect involved in the yacht’s design, told the daily La Stampa in an interview published on Monday. He added that the yacht might have taken on water through a side hatch that was left open.

Prosecutors said the incident was “extremely rapid” and could have been caused by a “downburst” – a localized, powerful wind that descends from a thunderstorm and spreads out quickly upon hitting the ground.

Similar to U.S. law, being investigated does not necessarily mean guilt, and formal charges against Cutfield may not be filed.

On Saturday, chief prosecutor Ambrogio Cartosio not only confirmed an investigation but also said his team will consider every possible aspect of responsibility, including those of the captain, the crew, those in charge of oversight, and the yacht’s manufacturer.

The Bayesian was a 184-foot vessel deemed “unsinkable” by its manufacturer, Italian shipyard Perini Navi.

Its crew survived the sinking, except for the chef. Six passengers were trapped in the hull.

Digital spoke with eSysman of the YouTube channel, to understand what might have gone wrong with the vessel.

“Obviously, any voyage plan takes the weather into account. Wind, wave sizes, and wave frequencies will be studied and precise weather prediction has improved over the years, but it’s still not 100%,” the host said, noting that the captain ultimately bears responsibility for the vessel.

‘ Bradford Betz, Reuters and