LOS ANGELES – 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, over concerns that sensitive data locked in its safes may interest foreign governments, multiple sources told CNN.

Italian Prosecutors who have opened up a criminal probe into multiple manslaughter and negligent shipwreck think the 56-meter (184-foot) yacht, the Bayesian, may contain highly sensitive data tied to a number of Western intelligence services, four sources familiar with the investigation and salvage operation said.

Lynch was associated with British, American and other intelligence services through his various companies, including the cyber security company he founded, Darktrace. That company was sold to Chicago-based private equity firm Thoma Bravo in April. Lynch, whose wife’s company Revtom Limited owned the vessel, was also an adviser to British prime ministers David Cameron and Theresa May on science, technology and cyber security during their tenures, according to British government and public Darktrace records.

The sunken vessel, lying on the seabed at a depth of some 50 meters (164 feet), is thought to have watertight safes containing two super-encrypted hard drives that hold highly classified information, including passcodes and other sensitive data, an official involved in the salvage plans, who asked not to be named, told CNN. Specialist divers with remote cameras have searched the boat extensively.

Initially, local law enforcement feared that would-be thieves might try to reach the wreckage to find expensive jewelry and other objects of value still onboard the yacht, according to divers with the Fire Brigade who spoke with CNN. Now they are concerned that the wreckage, expected to be raised in the coming weeks as part of the criminal investigation into the tragedy, will also be of interest to foreign governments, including Russia and China. They have requested that the yacht be guarded closely, both above water and with underwater surveillance.

“A formal request has been accepted and implemented for additional security of the wreckage until it can be raised,” Francesco Venuto of the Sicilian Civil Protection Agency confirmed to CNN. Lynch, his 18-year-old daughter Hannah, American attorney Chris Morvillo and his wife Neda, British banker Jonathan Bloomer and his wife Judy, and the yacht’s onboard chef Recaldo Thomas died when the ship sank in a violent storm in the early hours of the morning. Preliminary results from autopsies suggest that the Bloomer and Morvillo couples died of suffocation or “dry drowning” when the oxygen in an air bubble in a sleeping cabin ran out. Autopsy results for Lynch and his daughter were less clear. (CNN)…[+]