Rescue divers from Italy discovered the body of the last individual missing since the yacht owned by British tech entrepreneur Mike Lynch sank off the coast of Sicily, believed to be his daughter Hannah, according to a source who spoke to Reuters on Friday.

The British-registered Bayesian, a luxury sailing vessel measuring 184 feet, had 22 passengers and crew aboard. It was anchored near Porticello, close to Palermo, when it capsized and quickly submerged due to a storm that hit in the early morning on Monday.

While the source did not confirm that the body was 18-year-old Hannah Lynch, she was the sole individual still unaccounted for. Italian news agency Adnkronos reported her body was found inside the yacht, as stated by the Italian Coast Guard to the Associated Press on Friday.

The wreck lies at a depth of 50 meters with narrow passageways, making rescue operations challenging. On Friday, the fire brigade referred to the recovery efforts as “lengthy and delicate,” involving over 400 individuals, including 28 specially trained divers.

The bodies of five others who died in the incident, including Lynch, were retrieved on Wednesday and Thursday from within the yacht. The deceased included Judy and Jonathan Bloomer, a non-executive chair at Morgan Stanley International; and American lawyer Chris Morvillo from Clifford Chance, along with his wife, Neda Morvillo.

The body of the sole crew member who perished, onboard chef Recaldo Thomas, was located near the wreck on Monday.

Formal identification of the bodies and autopsies are anticipated to start once the last recovered body is transferred to a morgue in Palermo.

A legal investigation has commenced regarding the sinking, which has puzzled marine experts who claim that a vessel like the Bayesian, made by the esteemed Italian yacht builder Perini, should have withstood adverse weather conditions.

Authorities have questioned the yacht’s captain James Cutfield, along with the eight surviving crew members and passengers; however, they have refrained from making any public statements. Prosecutors conducting the investigation are scheduled to hold a press briefing on Saturday.

Complicated Salvage Effort

Giovanni Costantino, CEO of The Italian Sea Group, the parent company of Perini, informed Reuters that the sinking resulted from a series of “inexplicable, unacceptable mistakes” made by the crew, denying any issues with the yacht’s design or construction.

Recovering the wreck from the water, where it currently rests upright and seemingly undamaged, may provide insights for investigators, but the operation is expected to be both intricate and expensive.

Nick Sloane, an engineer from South Africa who managed the salvage of the Costa Concordia shipwreck in 2012, projected that the effort to salvage the yacht would cost about 15 million euros ($16.7 million) in interviews with local media on Friday.

He mentioned to La Repubblica that the salvage process would span six to eight weeks, including preparatory work, and needs to conclude by mid-October, yet did not disclose the reasoning behind this timeline.

Sloane explained that raising the yacht will need to be conducted “very, very slowly,” which may take several days to complete.

(Additional reporting by Giselda Vagnoni; writing by Alvise Armellini and Giulia Segreti; edited by Sharon Singleton)