Five days after the yacht left port, Lynch, his daughter, four guests, and a hired chef were dead in the Mediterranean Sea after a storm flooded the ship. The drowned included the chairman of Morgan Stanley International, a star witness at Lynch’s trial, as well as one of Lynch’s lead defense attorneys. Among the survivors were a former Autonomy exec who went on to become a partner at Lynch’s venture capital firm, a second member of his defense team, and his wife, who reportedly owns nearly all his fortune. The same day of the drowning, U.K. news outlets reported that Lynch’s co-defendant in the fraud trial, Stephen Chamberlain, who had also been acquitted, had been fatally run over by a car as he was out jogging—a shocking coincidence.

Less than a week after the tragedy, there are far more questions than answers. Did the yacht named Bayesian—an homage to a statistical theorem for predicting future outcomes—simply fall victim to a terrible storm? How did most of the crew and a few passengers escape, and why couldn’t they reach Lynch and the six others who did not make it out? Italian officials are looking into manslaughter charges, but it’s not yet clear who they may have in their crosshairs. Giovanni Costantino, who runs The Italian Sea Group that owns Perini Navi, the Italian maker of the yacht, had harsh words for the crew, who he blames. “This is the mistake that cries out for vengeance,” he told Reuters.

There are also huge questions swirling around the business ventures of the man dubbed the “British Bill Gates.” While the Bayesian excursion was to serve as a celebration of Lynch’s acquittal on all charges in the U.S.—where he had spent months under house arrest—the reality is that his legal troubles were far from over. In a January 2022 civil trial, the UK’s High Court found that HPE had “substantially succeeded” in proving that Autonomy leaders had fraudulently made it look like the company was earning more revenue than it was. In 2019 Autonomy’s CFO was convicted of 16 counts and sentenced to five years in prison. At this time, the UK case is in a holding pattern as the judge determines what damages are owed to HPE. (The company’s spokesperson Adam Bauer says HPE is, “saddened by this tragic event, and our thoughts are with the families and friends of all those who lost their lives.”)

But Lynch’s passing also looms over Invoke Capital, the venture firm he founded in 2011 and whose managing partner—Charlotte Golunski—survived the yacht disaster and saved her 1-year old baby. One of Invoke’s most prominent bets was a 2013 seed stage investment in Darktrace, a cybersecurity firm on whose board Lynch sat until 2018. Darktrace has developed a reputation as a sleek AI cybersecurity startup with ties to spy agencies like MI5 and the U.S. National Security Agency. It also became the target of short-sellers who in 2023 expressed doubt over Darktrace’s financial filings—the same sort of allegations that plagued Lynch’s Autonomy. 

Darktrace insists that the shortseller’s allegations were baseless, and they say an EY audit it commissioned showed this to be the case. In April Darktrace received a $5.3 billion acquisition offer from the giant private equity firm, Thoma Bravo. The deal, which Fortune reported will likely go forward despite Lynch’s death, stood to help rehabilitate Lynch’s business reputation. As of August 14, he and his wife collectively owned 3.21% of the company, which would be worth some $170 million upon the deal’s completion. Invoke Capital has not responded to multiple requests for comment and Darktrace declined comment.

Following his U.S. acquittal, Lynch was pleased enough with the state of things that he had begun celebrating weeks before the yacht party. In the days following the not-guilty verdict, Lynch, his wife, Stephen Chamberlain and his wife, the attorney Chris Morvillo—who drowned on Bayesian—and 20 other lawyers gathered at a restaurant at a hotel near the San Francisco courthouse.

Brian Heberlig, an attorney at Steptoe who gave the closing argument in Lynch’s trial, recalls that Morvillo gave a moving toast, telling those assembled that the trial was more than just a job, but one of their life’s works. “He really was a brilliant man,” Heberlig told Fortune, fighting back tears as he remembered Lynch. “And he ran his legal defense the same way I imagine he ran Autonomy. He let the experts do their jobs, while still having a strong grasp on the material. As he used to say, ‘Let the brain surgeons do the surgery.’”

That night was the last time Heberlig ever saw Lynch or Morvillo.

A ‘virtually unsinkable’ boat

The sailing party departed August 14—five days before the storm—and was comprised of 12 guests and 10 crew. The Bayesian was one of the biggest yachts of its kind. Its first stop was a cluster of small islands off the coast of Sicily. Then it jetted across the sea to the Sicilian town of Cefalu, before putting down anchor for the final time on the coast of Palermo, a favorite getaway for the rich and famous, and a former haunt for the mafia.

Lynch’s wife, Angela Bacares, who reportedly held the couple’s entire $1.1 billion fortune, was jolted awake on August 18 as the boat began to tilt. Glass from a shattered window exploded across the deck, according to reports, cutting her feet as she ran to investigate.

Black and white security footage appears to show the outline of what is believed to be the 184-foot sailing yacht, which used call sign 2ICB8, slowly disappearing behind a thicker and thicker veil of rain. Nearby villagers and fishermen say they saw a sea tornado, called a waterspout. Soon after, the yacht lay on the ocean floor.

Theories are swirling about why the yacht sank. One holds that a bay door was left open in the storm, causing the ship to flood and sink in minutes. Another holds that the Bayesian’s 246-foot tall aluminum mast—one of the tallest in the world—broke in the wind and took the boat down with it.

Most news reports say the yacht sank almost instantly, but the CEO of the company that bought the boat’s maker after it went bankrupt in 2021 disputes that. In a Financial Times report, he called the boat “virtually unsinkable,” and says that it dragged its anchor for 16 minutes before it sank. 

During those fateful moments, a far older nearby yacht, the Sir Robert Baden Powell, built in 1957, was drifting on a similar course as the Bayesian and not only survived, but came to help. Some onboard saw a red flare shooting across the rainy sky—an emergency signal from those who had fled the doomed yacht, drawing the attention to a life raft filled with 15 of the 22 passengers.

Passenger Golunski, 35, who helped run Autonomy the first year it was at HP, described holding her one-year old daughter Sophia, as she screamed for help. One of Lynch’s most trusted employees, Golunski was a founding partner at Invoke Capital, the London-based firm that backed Darktrace. Lynch’s wife Bacares was also in the life raft along with Clifford Chance lawyer Ayla Ronald, 36, who reportedly texted to her father: “there are deaths.”

The lifeboat survivors were soon plucked from the sea while the Bayesian came to its current resting place 50 meters below the surface. Over the course of the next 72 hours, a team of scuba divers from the Guardia Costiera and specially trained cave divers from the Vigili del Fuoco, the local fire department, used boats and a helicopter to triangulate the yacht’s position. The divers, working in bursts of 8 to 12 minutes, searched the Bayesian’s six guest suites, master suite, multiple living areas, and dining room.

The body of the yacht’s chef, Recaldo Thomas, was the first to be found, floating on the water’s surface. On Wednesday, two days after the wreck, four more bodies were discovered, and on Thursday a fifth. Among them were Lynch and Chris Morvillo of the prestigious law firm Clifford Chance, who had made the controversial decision to have Lynch testify, and questioned him on the stand right before he was acquitted. The others discovered were Morvillo’s wife, Neda, as well as the Morgan Stanley banker and key witness, Jonathan Bloomer, who had been a former executive director at Autonomy, and his wife Judy. The body of Lynch’s 18-year-old daughter, Hannah, was pulled from the sea on Friday.

The U.K. Maritime and Coastguard Agency tells Fortune it is in contact with the Italian authorities but would not provide further information. The UK’s Foreign Office told Fortune it is providing “consular support to a number of British nationals and their families…and are in contact with the local authorities.”

More questions than answers

Even as loved ones and the survivors begin to come to terms with the human toll of the tragedy, the business world has begun assessing Lynch’s complicated past, and his many business dealings. 

Lynch was born of modest means to a nurse and firefighter in a suburb of London. From an early age he showed a proclivity towards technology and a fiery determination. He studied Natural Sciences at Cambridge, then returned for a PhD in artificial neural networks, the building blocks of artificial intelligence. When he was still studying for his PhD, he started his first venture, Cambridge Neurodynamics, monetizing computerized fingerprint recognition, eventually evolving into Autonomy. 

Founded in 1996 with David Tabizel and Richard Gaunt, Autonomy used an early version of artificial intelligence to quickly scan what’s known as “unstructured data,” especially including language. Autonomy quickly became a darling of the UK’s fledgling tech scene, and it was seen as a crowning achievement when, in 2011, the company struck an $11 billion deal to be purchased by HP, now HPE. The deal, however, was quickly engulfed in scandal when a year later the new owner alleged accounting fraud and wrote down its investment by $8.8 billion.

Despite the baggage around Autonomy, Lynch continued to ride high in the tech world through his venture firm, Invoke Capital, which he founded in 2012. One of its most profitable investments was Darktrace, which he backed in 2013 and joined as a board member. By 2016 he told TechCrunch 60 employees from Autonomy were working at Invoke, that he’d raised a billion dollars to invest in startups, and that Darktrace was worth $500 million.

While fighting the legal battle over Autonomy and building Invoke, Lynch enjoyed the trappings of a mogul. The same year he announced his billion-dollar startup fund, he was sailing the Bayesian, worth an estimated $25 million. He reportedly also owned a $6 million, 69-acre Georgian manor.

By early 2020 Darktrace shared deep connections with Autonomy, including half of Darktrace’s board and six of its eight top executives. The following year Darktrace went public, soaring 40% above its pre-market value. But the victory lap was brief. In September 2022, an acquisition talk between private equity firm Thoma Bravo and Darktrace fell through, sending share prices tumbling. In early 2023, the short-selling firm Quintessential Capital Management published a 70-page report accusing Darktrace of similar misconduct that had sunk Autonomy.

“We are deeply skeptical about the validity of Darktrace’s financial statements,” the report read. Darktrace’s shares plunged as much as 17% after the report was published, though the company said at the time that the management team and board had “rigorous controls in place.” Darktrace hired EY to perform an audit, which stabilized its share price after the accounting firm found the company’s earlier financial results did not need to be restated. Darktrace never publicly released the report, however, with a spokesperson saying at the time that it contained “commercially sensitive information.”

More recently, Darktrace’s CEO Poppy Gustafsson wrote in the firm’s Q4 trading report of “shareholders voting overwhelmingly in favour” of the acquisition, and added the company is “awaiting the conclusion of the remaining regulatory processes.”

Until very recently, Darktrace had sought to distance itself from Lynch and his VC firm. In December, shareholders passed a resolution that rejected Invoke executive Patrick Jacob’s reappointment to its board. This April, Invoke lost the right to that same board seat when it was discovered its shares had fallen below the required 10% threshold. Nonetheless, in a memorial to Lynch, Darktrace CEO Poppy Gustafsson wrote: “Without Mike, there would be no Darktrace. We owe him so much.”

While the Italian authorities continue to investigate the crash site, one thing is certain: the swirl of legal and business battles that surrounded Lynch during his lifetime are likely to continue after his death. A local Italian news site reports that the public prosecutor’s office in a nearby town, Termini Imerese, is looking into allegations of manslaughter surrounding the sunken boat. And two months before Lynch died, former UK secretary of state David Davis reportedly said he was working with Lynch to scrap U.S./U.K extradition agreements that allowed Lynch’s trial to happen in the first place. 

On Wednesday, August 21, Davis told GB News he would continue that fight in memory of Lynch. “We need to get a grip of this,” said Davis. “Mike, when he’d won his case, almost the first thing he did was ring me up and say, ‘we’re going to have to defeat this treaty, we’re going to have to overcome this treaty and get it changed for the better.'”

“I am looking forward to returning to the U.K. and getting back to what I love most: my family and innovating in my field,” Lynch said after the verdict.

Lynch’s desire to extend the legal fight even after his not-guilty verdict reflects the scrappiness he displayed throughout his life. This helped him ascend to the highest rungs of business and moguldom—but the success also came with a tenuous quality as questions about his business dealings dogged him for years. The not-guilty verdict and the pending Darktrace sale meant Lynch was in position to finally cast off that shadow. But now his ultimate legacy is poised to be tied forever to a mysterious and tragic hour on the Mediterranean Sea.