The 56m UK-flagged Bayesian was carrying 22 people - 12 passengers and 10 crew - when a heavy storm that created waterspouts struck early on Monday. Five bodies have been recovered from the wreck of the boat, with one person still missing. It will be a long time before we get answers as to exactly how the luxury superyacht sunk.
Speculation has swirled about what went wrong, with fingers being pointed at the captain, the crew, and faults with the yacht itself. But experts have told the BBC that this was likely a "black swan" occurrence of freak weather - and that no-one is necessarily at fault. Here are the key questions that investigators will be asking as they look into the tragedy.
One of the key questions facing investigators is the role of the boat's keel. A keel is a large, fin-like part of the boat that protrudes from its base. The bottom of the keel - which is the lowest part of the boat - contains a huge weight, the bulb, which keeps the boat stable.
When the wind pushes the boat onto its side, the keel rises through the water until - like a see-saw - the weight of it pushes the boat back level. On a boat the size of the Bayesian, keels are often designed to be retracted so that the vessel can dock in areas that aren’t as deep, like a harbour. When the keel is raised, it makes the boat much less stable.
In this case, the wreck of the Bayesian was found at a depth of 50m (164ft), which suggests there was no reason that the keel needed to be retracted. But that doesn.