Sudden, hurricane-force winds toppled the luxury Bayesian superyacht that sank off the coast of Sicily last August, according to an interim report into the disaster, which found the boat had “vulnerabilities” to extreme wind which were not known to the owner or crew.

Investigators say the large mast of a yacht owned by the family of British tech mogul Mike Lynch’s left it vulnerable to high winds.

An official report into last year’s yacht tragedy, which killed seven, found that the boat could easily capsize in high winds. Its towering mast made it more vulnerable.