It's in the reports from survivors, like the woman who was thrown into the sea with her baby.
As has the anchor dragging which os confirmed via the location tracking system. As are the fact the boat was designed to be able to right itself from a virtually horizontal position IF all the hatches were closed and the keel was lowered to 10m as it should have been in 50m deep water with a storm forecast.
The boat has a living room etc below deck. If, for example the keel was not lowered and the boat tipped so far it took on water at deck level and the watertight doors to the living area were not closed (as they should be with a storm forecast) and water entered there then it would have made it virtually impossible for passengers in the cabins (down a further narrow staircase and corridors from that) to have exited. It would also have meant the ship could not right itself as it is designed to do. That is the only thing that is speculation on my part: what I suggested might have gone wrong, because it's quite clear some things did go very badly wrong otherwise it would not have sunk. The captain was very experienced and the boat built by a reputable yard to well-tested designs.
But the survivors (who were all on deck when the boat went down) who have released accounts of what happened (not the crew, obviously, who will have been advised not to say anything during the investigation) state they were thrown into the sea suddenly. The divers have stated the mast is in tact. The tracking shows dragging anchor for approx 15 mins before the sinking, which happened very quickly after that. The storm was forecast hours beforehand but nobody could have predicted the downburst.
Boats nearby, however, were ok because they had started their engines, ensured everyone was awake and all hatches and watertight doors were closed. With engines on they had better control of their boats, including the captain of the nearby boat who rescued the survivors. Why the Bayesian didn't start its engines during 15 mins of dragging anchor is very odd. It has huge fuel tanks, sufficient to travel thousands of miles.
In all likelihood as I said it won't be one factor, it will be a series of very unfortunate contributary factors compounding each other by happening to occur simultaneously and clearly very bad luck with a localised weather event far worse than anybody could have predicted. However, given the additional volatility of those seas in recent years with climate change and that particular area being notorious for losses at sea, with a storm forecast all precautions such as fully lowering the keel, checking hatches and ensuring passengers were on deck with lifejackets when it started should have been taken.
This ship had sailed through many storms. It crossed the atlantic multiple times. Its sister ship has been to the Antarctic. There is even footage of it tipping to an almost 90 degree angle in a storm and righting itself previously. Uncomfortable for the passengers, but necessary. It should not have sunk so something in addition to the severe weather event seems to have happened concurrently. Did the systems fail so the engine wouldn't start or the systems said hatches were secured by they were not? Or was it human error, on top of the storm? Nobody knows, hence the investigation.
Just so tragic, after what Mr Lynch had endured over the last decade, when finally he had his freedom back. And for his young daughter to die as well, separated from all of the others trapped below deck. Their final minutes must have been beyond terrifying and my thoughts are with their families and the poor survivors who doubtless have been through extreme trauma.