Specialist divers surveying the wreckage of the $40 million superyacht that sank off Sicily in August, killing eight people including British tech tycoon Mike Lynch, have asked for heightened security to guard the vessel,

Lynch, who had connections with various intelligence services through his companies—including the cybersecurity firm Darktrace, which was recently sold to a private equity firm—had previously advised British prime ministers on technology and cybersecurity matters.