Not exactly unsinkable according to some folks.
"The MAIB’s investigation revealed critical stability issues that may have contributed to the disaster. The yacht was found to be vulnerable to high winds when in specific conditions – particularly when motoring with sails lowered, centreboard raised, and in ‘loaded arrival’ condition (i.e. 10% consumables on board). These vulnerabilities were not documented in the vessel’s stability information book and were unknown to both the owner and crew."
The UK Marine Accident Investigation Branch (MAIB) has released an interim report detailing the tragic sinking of the superyacht Bayesian off Sicily’s northern coast that left seven dead. According to...
gcaptain.com