Seven people died after the yacht went down off the coast of Porticello, Sicily, on August 19, including Lynch and his 18-year-old daughter Hannah.

The super-yacht sunk off the coast of Sicily early Monday.

Mike Lynch, the tech tycoon killed when his superyacht sank, died of suffocation from a lack of oxygen, an investigative source has said.

Four victims of Mike Lynch's sunken superyacht were likely trapped in air bubbles before suffocating, La Repubblica reported, citing autopsy results.

British tech tycoon Mike Lynch died of suffocation after running out of oxygen, an investigative source said, citing initial examinations carried out on Saturday after his body was recovered from the family yacht that sank off Sicily's coast last month.