Mr Lynch, his daughter Hannah, Jonathan Bloomer, the Morgan Stanley International bank chairman, and his wife, Judy, Chris Morvillo, a lawyer at Clifford Chance, and his wife, Neda, are still missing.
Sam Jefferson, editor of the magazine Sailing Today, suggested that there may have been enough hatch doors open to cause the vessel to sink.
He said: “I would have said that the boat g`ot hit very hard by the wind, it was pinned over on its side.
“I imagine all the doors were open because it was hot, so there were enough hatches and doors open that it filled with water very quickly and sank like that.
“The reason it got pinned over so hard was because the mast is huge.”
Andrea Ratti, a nautical design professor at Milan Polytechnic University, said a boat the size of the Bayesian, a British-flagged 56-metre superyacht, could only sink so rapidly by taking in a huge amount of water, as CCTV emerged capturing the moment it was battered during the ferocious storm.