Morgan Stanley International chairman Jonathan Bloomer, his wife, attorney Chris Morvillo and Nada Morvillo are among the six people missing after a luxury yacht sunk off the coast of Sicily, a senior civil protection officer told PEOPLE on Monday, Aug. 19.

Local officials previously told PEOPLE that the two other people missing are British tech entrepreneur Mike Lynch and his 18-year-old daughter Hannah.

Bloomer is a close friend of Lynch. Chris Morvillo is Lynch’s attorney.

A source tells PEOPLE that the expert underwater team has returned to base and was not able to make any inroads into the vessel Monday night.

The rescue teams theorize the missing people are possibly trapped inside the hull, Palermo Today reported.

The six people went missing after a 56-meter (183-ft) yacht, the Bayesian, carrying 22 people sank after a storm near Porticello, Italy, at around 5 a.m. local time on Monday, Aug. 19, per an Italian Coast Guard statement obtained by PEOPLE.

Sicilian news agency Ansa reports that eyewitnesses revealed that the yacht was anchored when it was struck by a tornado over the water, known as a waterspout, and lost its balance, causing it to sink.

At the time of publication, only one person’s body was recovered. The body of the boat’s cook was found near the vessel on Monday morning, per Palermo Today.

Since the sinking, Coast Guard patrol boats and firefighters have rescued 15 people after divers reached 49 ft. below the sea surface to the vessel, according to the outlets.

Of those rescued, eight were taken to local hospitals. Among those saved were Lynch’s wife, Angela Bacares, and a one-year-old English girl named Sophie, her mother and Lynch’s colleague, Charlotte Golunski.

Golunski lost her grip on her 1-year-old daughter when a wave smashed against them, taking the child out to sea. But that same wave returned Sophie a short time later in what was described as something of a miracle, according to the local sources.

Golunski told Italian newspaper la Repubblica that she briefly lost her daughter for about two seconds due to the intensity of the sea but was then was able to retrieve the child

“I held her afloat with all my strength, my arms stretched upwards to keep her from drowning,” Golunski told the newspaper, according to a translation. “It was all dark. In the water I couldn’t keep my eyes open. I screamed for help but all I could hear around me was the screams of others.”

Sophie was sent to the Children’s Hospital of Palermo, where she was reunited with her mother, who received minor injuries in the incident, per Ansa, The Independent and Corriere Della Sera.

Sophie’s father, James Emsley, survived the incident, Sicily’s civil protection agent Salvo Cocina said, according to Sky News.

Search and rescue efforts continue, the Coast Guard said, as does an investigation into the incident.

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A representative for Morgan Stanley did not immediately respond to PEOPLE’s request for more information on Monday.