There are 3 main reasons Mike Lynch's superyacht may have sunk. None give much hope for finding more survivors.
Briefly

"The City Council of Bagheria said the wreck was likely caused by bad weather in a press release published on Monday. A strong storm hit the area about an hour before the superyacht sank, it said."
"Matthew Schanck, a maritime search and rescue expert, told Business Insider that the situation was 'unprecedented' because it's difficult for meteorologists to predict when waterspouts will occur."
"Divers on Wednesday entered the superyacht after breaking a window. They now have to contend with narrow corridors and floating debris as they search for survivors."
"Rick Shema, a consulting meteorologist, told USA Today that waterspouts are rare and can be triggered by unusually hot weather."
Read at Business Insider
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