What we know about the sinking of Mike Lynch's superyacht off Sicily
Adds details after prosecutors' press conference
ROME, Aug 26 (Reuters) -The sinking of a luxury yacht on Aug. 19 off the northern coast of Sicily left seven people dead, including British tech tycoon Mike Lynch, his daughter Hannah and Morgan Stanley's Jonathan Bloomer.
Here is what we know about the accident.
VIOLENT STORM
The Bayesian, a British flagged 56-metre (184-feet) superyacht, sank in the pre-dawn dark off the port of Porticello, near Palermo, after a very severe and sudden weather event.
Prosecutor Raffaele Cammarano said on Saturday the event was most likely a "downburst", a very strong downward wind that is an intense but relatively frequent event at sea, rather than a waterspout which involves rotating winds like a whirlwind or tornado.
Twenty-two people were on board, and 15 survived, including nine out of10 crew members as well as Lynch's wife, whose company owned the Bayesian. They were found on a life raft. Six out of the 12 passengers died.
Prosecutors, who have put the yacht's captain James Cutfield under investigation for manslaughter and shipwreck, said the ship would have to be pulled out of the water before the investigation could be concluded.
STERN FIRST WENT DOWN
The Bayesian sent its last signal before sinking via the tracking Automatic Identification System (AIS) at 0206 GMT, according to the MarineTraffic website.
Chief Prosecutor Ambrogio Cartosio said a red flare alerting emergency services about the emergency was fired into the sky at 0238 GMT, more than 30 minutes after the boat had gone down.
The head of Palermo's Fire Brigade, Girolamo Bentivoglio Fiandra, said the boat sank from the stern and is lying on its starboard side at a depth of around 50 metres (164 feet).
In the yacht, the bodies of the dead were found in the cabins on the left-hand side of the boat, where the passengers may have tried to search for remaining bubbles of air, he added.
Prosecutor Cammarano said the passengers were all probably asleep at the time of the storm which was why they failed to escape.
THE OTHER BOAT
The nearby yacht, the 42-metre Sir Robert Baden Powell, remained anchored and weathered the storm after its captain turned on the engine to keep control and avoid a collision with the Bayesian.
The captain, Karsten Borner, said he did not know if the crew of the Bayesian had managed to switch on its engines.
"I only know that they went flat with the mast on the water and that they sank in two minutes," he said.
'INCOMPREHENSIBLE'
Andrea Ratti, a nautical design professor at Milan Polytechnic university, said a boat the size of the Bayesian could only sink so rapidly by taking in a huge amount of water.
He suggested that one or more portholes, windows or other openings may have been left open, broken or smashed by the storm, letting in water.
However, an industry expert in Britain said it should have taken hours for the Bayesian to fill up with enough water to sink it, making its swift demise incomprehensible.
The Bayesian had a retractable keel - a fin-like stabilising structure under the hull which can be partially lifted to reduce the depth of the boat when entering shallow waters or harbours.
Several experts have wondered if the yacht had been moored with its keel up, potentially compromising its stability in a violent storm.
UNSINKABLE
The Bayesian was built in 2008 by Perini Navi, an Italian luxury yacht maker. It featured the world's tallest aluminium mast, measuring 72 metres, but early reports that the mast broke in the storm have so far proven unfounded.
Giovanni Costantino, CEO of the Italian Sea Group, which owns Perini, said the yacht was "one of the safest boats in the world" and basically unsinkable.
He alleged that the sinking was due to a chain of human errors given that the storm was expected. He made his assertions partly based on data from the Automatic Identification System. The captain and other crew members have not spoken publicly about the disaster and attempts by Reuters to reach them have been unsuccessful.
Costantino said that had the crew shut all doors and hatches, turned on the engine, lifted the anchor, lowered the keel and turned the yacht to face the wind, it would have suffered no damage.
He added that data showed it took 16 minutes from when the wind began buffeting the yacht, and it began taking on water, for it to sink.
Reuters has not been able to confirm his assertions.
Reporting by Giselda Vagnoni, additional reporting by Giulia Segreti, Alvise Armellini, Matteo Negri, Giulio Piovaccari and Josephine Mason in London; Editing by Sharon Singleton
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