The Bayesian was a world-class yacht.

The 19th largest yacht designed by luxury Italian manufacturer Perini, it boasted a sleek interior design by French designer Remi Tessier, a double engine, and one of the tallest aluminum masts in the world. It won multiple awards, including for "best sailing yacht" the year after its release.

But, almost two weeks ago on Aug. 19, the luxurious vessel sank to the bottom of the ocean off the coast of Sicily in an internationally-followed disaster, dumping 22 people aboard into the water and leaving seven dead, including British tech magnate Mike Lynch and his 18-year-old daughter Hannah.

"The impossible happened on that boat," Giovanni Costantino, the yacht manufacturer's CEO, told Reuters.

In the wake of the disaster, an ongoing investigation into possible criminal errors committed by the Bayesian's crew and lingering questions surrounding its design underscore the need for proper yacht safety measures and practical ship designs, according to experts.

Italian prosecutors from a nearby town have now widened their investigation into possible criminal actions by the ship's captain in the lead-up to the shipwreck to include two additional crew members, a judicial source told Reuters on Wednesday.

Tim Parker Eaton and Matthew Griffith are now under investigation for manslaughter and shipwreck, days after news broke that investigators are probing whether Captain James Cutfield committed the same crimes.

Authorities are looking into whether Parker Eaton, a ship engineer, failed to protect the ship's engine room and operating systems. Griffith, a sailor on the ship, was on watch duty on the morning the ship sank.

Cutfield "exercised his right to remain silent" when investigators interrogated him on Tuesday, Giovanni Rizzuti, his lawyer, told Reuters.

"First, he's very worn out," Rizzuti said. "Second, we were appointed only on Monday, and for a thorough and correct defense case, we need to acquire a set of data that at the moment we don't have."

Rizzuti did not immediately respond to a request for comment emailed to him by USA TODAY.

Rescuers found the bodies of Chris Morvillo, an American citizen and lawyer for Clifford Chance, his wife, Neda Morvillo, Jonathan Bloomer, a non-executive chair of Morgan Stanley International, and his wife, Judy Bloomer, inside the ship two days after the wreck. Recaldo Thomas, the ship's cook who also went by Ricardo, was the first person pronounced dead in the disaster – his body was recovered on the day of the sinking.

Captains must follow safety procedures before storms

Costantino chalked up the boat's fate to a "series of indescribable, unreasonable errors" committed by the crew. The ship's crew made an "incredible mistake" in not preparing adequately for the storm, he said.

Costantino said the crew should have summoned passengers from their rooms earlier, as the storm picked up. The keel, a heavy weight under the ship to counterbalance the ship's large mast, should have been lowered, and portholes should have been closed – both factors that could influence whether the captain is found culpable, according to experts.

Captains should always check weather forecasts and look into local weather patterns, Mitchell Stoller, a maritime expert witness and captain, told USA TODAY. When in stormy weather, captains should also weigh anchor, so that a ship can float over unstable waters, he added.

"The general standard of care in this situation is to monitor the weather, exercise caution, have a night watch, have the engine going, ready to maneuver," he said.

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Wealthy clients push for impractical designs, expert says

Costantino said the ship's design and construction was error-free. But one yacht design expert disagrees.

"There's so many other factors, and this huge, complex boat is part of it," said Tad Roberts, a British Columbia-based yacht designer who has worked in the industry for nearly 40 years.

The Bayesian's giant mast is part of a trend of bigger and bigger yachts, according to Roberts. He worked on the design of the Asolare, formerly the Scheherazade – at 154 feet long, the largest cold-molded sailing yacht in the world when it was released in 2003, according to its manufacturer, Hodgdon Yacht Services. "It's small today," Roberts added.

Roberts said problems emerge when yacht designers can't say no to wealthy clients' demands for more and more extravagant and overgrown designs.

"The clients are wealthy people. They are very used to getting whatever it is they want," he said.

But owners' requests can compromise security, he said.

"Owners are not naval architects," he said. "They don't understand the issues involved, and trying to explain to them may or may not work, but there are compromises being made all the time."

Yacht buyers are more likely to get a better boat than they would 50 years ago, since yachts are exported and built towards international standards, he said. Still, the worsening effects of climate change and extreme weather are growing risks to anyone sailing the high seas, he added.

"Be aware. That's the biggest part of it," he said. "There's a possibility that things could go bad, that there is risk involved."

More:Investigators seek answers to why luxury superyacht Bayesian sank in storm

Yacht owners install million-dollar, AI-powered security systems

Piracy on yachts is even rarer than sudden storms – only two cases were reported between 2019 and 2023, according to the International Maritime Bureau's Piracy Reporting Centre. Still, superyacht owners are investing in James Bond-esque technology in an effort to protect their vessels.

"There's definitely increased concern," said Frederik Giepmans, managing director of safety and security at MARSS, a technology company that offers high-tech surveillance and security systems for superyachts with a price tag "from the hundreds of thousands into millions," he said.

NiDAR, a software program manufactured by MARSS to provide protection for superyachts, can pick up on objects approaching a yacht from the air or water "while underway, at anchor and in port," according to the company's website.

The surveillance system uses artificial intelligence and machine learning to handle data from sensors monitoring all sides of a vessel. The AI system provides "constant, long range monitoring of the air, of the surface, of the underwater, to try and give the crew as much response time as possible," said Giepmans.

That way, yacht owners can pick up on any manner of approaching objects, from "small, fast craft approaching on the surface" to divers and submarines under the water.

But if a threat is detected, a yacht owner's "options to respond are limited," Giepmans said. "You can get out of the way. You can bring people to safety. But, for instance, a more military response is not available to you."

Giepmans pointed to a recent increase in attacks on commercial ships, like attacks carried out by Houthi rebels on ships cruising through the Red Sea. "There's a gap there in terms of security," he said. "Because there isn't really, right now, a way for commercial or private clients, to respond, perhaps, in an appropriate way to these threats."

Luxury yacht owners cruising off the coast of Monaco, for instance, shouldn't be as concerned about a direct threat to their security, as compared with boats sailing through other locations, he said. "It really depends on that, as to what extent they will go to protect their ship."

The greater danger could come from adverse weather events, as the planet warms every year.

Meteorologists have pointed to a water spout, a tornado that spun up over the water amid the storm that hit the Bayesian, as a possible factor in its wreck.

Water temperatures in the area were more than three degrees higher than average that day, the perfect conditions for the spout to form and the likely result of climate change, Rick Shema, a certified consulting meteorologist and former member of the Navy, previously told USA TODAY.

"The water spout was an uncommon occurrence. But again, these things happen, especially in warmer water," he said.

Contributing: Reuters

Cybele Mayes-Osterman is a breaking news reporter for USA Today. Reach her on email at [email protected]. Follow her on X @CybeleMO.