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What we know of the sinking Mike Lynch's Superyacht

Seven people were killed in the sinking of an luxury yacht off the coast of Sicily on August 19, including British tech mogul Mike Lynch, Hannah, and Jonathan Bloomer, a Morgan Stanley executive.

What we know so far about the incident.

STORM VIOLENT

The Bayesian (a 56-metre-long superyacht with a British flag) was anchored near Porticello in Palermo when it went down during a sudden and severe weather event.

The prosecutor Raffaele Cammarano stated that the event most likely was a "downburst", which is a strong downward wind at sea. It's not a waterspout, because it involves rotating winds similar to a tornado.

The coast guard stated that given the weather forecast it was not a problem for the Bayesian to be moored off shore rather than sheltering in port. A yacht that was anchored near the Bayesian survived the storm without damage.

Lynch's spouse, who owned the Bayesian, was one of 15 survivors. Surviving survivors were discovered on a liferaft.

THREE CREW MEMBERS UNDER INVESTIGATION

Three crew members are currently under investigation by prosecutors in Termini Imerese near Palermo: Captain James Cutfield and ship engineer Tim Parker Eaton.

The suspects are suspected of manslaughter or shipwreck. However, being investigated in Italy doesn't imply guilt. It also does not mean that formal charges will be filed. The investigation will take time, and salvaging the shipwreck is required by prosecutors.

According to MarineTraffic, the Bayesian sent out its last signal via the Automatic Identification System (AIS), just before it sank at 0206 GMT. The vessel is lying on its back at a depth around 50 meters (164 feet) and now lies on its right.

Ambrogio Carttosio, the chief prosecutor of Termini Imerese, said that a red flare was launched into the sky to alert rescue services. This occurred at 0238 GMT - more than 30 min after the boat went down.

PUZZLING

The rapid descent of the Bayesian undersea has confused seafarers and naval engineers who claim that the vessel should not have taken so many hours to fill with enough water to sink.

Some have suggested that portholes, window or other openings were left open or broken by the storm. This allowed water to enter.

Former captain Stephen Edwards, who has a Linkedin account, wrote that the yacht could tilt up to 90 degrees depending on whether or not its keel is down. It would still return to a vertical position.

He stated that the "Downflooding angle", which is the angle at which water can enter the vessel through the engine room, or ventilation ducts was between 40 and 45 degrees. Once exceeded, the yacht would be "in serious danger".

Experts have questioned whether the yacht's keel had been up while moored, possibly compromising its stability. Edwards, however, said that the operating rules of the boat did not require the keel to be down when at anchor.

The keel, a stabilising structure similar to a fin under the hull of a boat, can be raised in order to reduce its depth when the boat is in shallow water or harbours. It could, in Bayesian terms, reduce the yacht’s surface below the water from 10 to 4 meters.

UNSINKABLE

Perini Navi is an Italian luxury yacht builder. The 72 metre (236 foot) tallest mast in the world was featured on this yacht.

Giovanni Costantino said that the Perini yacht is "one of most safe boats in the World" and virtually unsinkable.

He claimed that the sinking occurred because of a series of human mistakes, as the storm had been predicted. His assertions were partly based on the Automatic Identification System.

Costantino stated that if the crew had closed all the doors and hatches and started the engine and lifted the anchor and lowered the keel, the yacht would not have been damaged.

I was unable to confirm the claims of his.

The captain and crew members haven't spoken out publicly about the tragedy and all attempts to contact them have failed.

(source: Reuters)