Divers have entered the sunken superyacht as they continue to search for the bodies of six missing people, but face "significant challenges" during the rescue operation. British tech tycoon Mike Lynch and his 18-year-old daughter Hannah are among six missing after a luxury yacht sank in a tornado off the coast of Italy. One person has already been declared dead .

The British-flagged superyacht Bayesian is still largely intact on the seabed, but the 50m depth makes it difficult to access, and the time window divers have make searches is incredibly tight, according to one of those leading the effort. Among those diving are two cave divers, who will have experience navigating through tight areas. 'We didn't see it coming': Superyacht latest "They can stay underwater for a maximum of 12 minutes, two of which are needed to go up and down," emergency responder Luca Cari told Italian daily Giornale Di Sicilia.

"So the real time to be able to carry out the search is 10 minutes per dive." More on Superyacht Sinking Search continues for British tech tycoon Mike Lynch and Morgan Stanley International boss after yacht sinks in Sicily tornado Bayesian: What we know about the superyacht that sank Family of Mike Lynch's co-defendant who died after car accident days before yacht sinking pay tribute Related Topics: Superyacht sinking Divers have entered the lounge via a ladder and are now trying to find the best access point to enter the rest of the yacht. Mr Cari explained how the divers had.