More than 150 years after Oliver Deveau climbed aboard an empty, drifting ship, the question of what actually happened to the ten people of the Mary Celeste has generated one of the largest bodies of speculation in maritime history, everything from perfectly reasonable scientific hypotheses to outright fiction that millions of people still mistake for documented fact.
Before weighing what's actually plausible, it's worth understanding how much of the popular version of this story isn't true at all.
The Fiction That Became "Fact"
In 1884, a young doctor and aspiring writer named Arthur Conan Doyle, more than a decade before he'd create Sherlock Holmes, published a short story in Cornhill Magazine called "J. Habakuk Jephson's Statement." It was pure fiction, written in the voice of a fabricated survivor, but Doyle based it loosely on the real Mary Celeste case, and the resemblance was close enough that a huge number of readers took it at face value.
Doyle's fictional version invented almost everything dramatic that people now associate with this case. He changed the ship's name slightly, to "Marie Celeste", a small error that stuck so thoroughly in public memory that even now, many retellings still use the wrong name. He described the ship discovered in a pristine, almost staged state, breakfast supposedly still warm on the table, lifeboats still aboard rather than missing, none of which matches the real ship, which had been through rough weather, was taking on water, and was missing its only lifeboat. His plot involved a vengeful escaped former slave seizing control of the ship, a detail with no basis whatsoever in the real case. None of it was true. All of it spread.
Doyle wasn't even the only writer to do this. In 1913, The Strand Magazine published something called the "Abel Fosdyk Papers," presented as a genuine firsthand account from a man who claimed to have been aboard the Mary Celeste as Captain Briggs's step-nephew, describing an elaborate death-by-drowning scenario involving the entire crew watching a swimming contest from a collapsing platform. It was, like Doyle's story, complete fabrication, there's no historical record of any "Abel Fosdyk" connected to the ship at all, but it got treated as a real discovered document by plenty of readers who wanted a definitive answer badly enough to accept one.
Between Doyle's fiction and Fosdyk's fabrication, most of what casual retellings of this story get wrong traces back to these two sources, not to anything that actually happened in 1872.
The Theories Investigators Ruled Out Quickly
Some explanations fall apart almost immediately against the physical evidence covered earlier in this series. Piracy doesn't hold up, the cargo, the crew's personal belongings, and anything else worth stealing was left completely untouched, which makes no sense for an attack motivated by robbery. Mutiny and the drunken-crew-murder theory Solly-Flood floated during the Gibraltar inquiry run into the same wall: no blood, no signs of struggle anywhere aboard, and a crew that multiple sources describe as experienced and well-regarded, sailing alongside a captain's own wife and small daughter, hardly the ideal circumstances for a violent uprising. Sea monsters and a supposed Flying Dutchman curse belong more to nineteenth-century sailors' folklore than to any documented investigation, entertaining as they are.
The Waterspout and Seaquake Theories
Two related natural-disaster theories have more surface plausibility. Under the waterspout theory, a violent, localized weather phenomenon could have struck the ship, driving a sudden drop in barometric pressure that forced bilge water up into the ship's pumps, potentially making the crew believe they were taking on dramatically more water than they actually were, panicking them into abandoning a ship that wasn't really in danger of sinking.
A related idea involves a submarine earthquake, or seaquake, somewhere near the Mary Celeste's position, theoretically violent enough to displace cargo and rattle the crew into a similar panic. Both theories share the same basic weakness: there's no direct geological or meteorological record confirming either event actually occurred at that specific time and place, and neither one fully explains why the ship was found still under partial sail and apparently drifting for an extended period, rather than showing clearer signs of having been abruptly overwhelmed.
The Leading Theory: Alcohol Vapor
The explanation most historians and scientists now consider the strongest starts with the cargo itself. Of the 1,701 barrels of denatured alcohol aboard, nine were later found completely empty. Notably, those nine barrels were made of red oak, a more porous wood than the white oak used for the rest of the cargo, which would have made them considerably more prone to leaking their contents as vapor into the sealed hold over the course of a multi-week voyage.
In 2006, chemist Andrea Sella, a professor at University College London, tested whether that kind of vapor buildup could plausibly explain what happened. He built a scale replica of the Mary Celeste's hold, used butane to stand in for the alcohol vapor, and ignited it. The result was a genuine pressure-wave explosion, a visible, forceful blast wave strong enough to blow open doors and hatches, but one that left behind no scorching, no soot, and no lasting fire damage, which matches the ship's actual condition when it was found remarkably well. Sella's conclusion was that a real alcohol vapor explosion, or even just a terrifying near-miss version of one, could easily have convinced an experienced, safety-conscious captain like Briggs that his ship was in genuine danger of catching fire or exploding outright, more than enough to justify an emergency evacuation, even if the real physical damage turned out to be minimal.
Piecing It Together: The Modern Consensus
The most complete version of events, developed by documentary researcher Anne MacGregor for a Smithsonian Networks-funded investigation, combines several of these threads into a single sequence that accounts for more of the evidence than any theory on its own.
Under this reconstruction, Briggs's crew likely first grew alarmed by a combination of factors: the alcohol vapor risk described above, and a pump that may have been giving a falsely alarming reading of how much water had actually collected in the hold, thanks to a partial mechanical fault. Compounding the problem, newly reviewed navigational records suggest the ship may have actually drifted roughly 120 miles off Briggs's own calculated position, meaning the crew might genuinely not have known exactly where they were relative to land, adding real uncertainty to an already tense situation. MacGregor's theory holds that Briggs made the difficult, ultimately fatal call to evacuate everyone into the ship's small yawl, intending to stay close by, tethered to the Mary Celeste on a tow line, until the immediate danger passed or they could get their bearings.
If that's what happened, the fatal moment likely came down to something almost unbearably small: that line, under worsening weather, simply gave way. Once separated from the Mary Celeste, with no sail, minimal supplies, and an infant aboard, the ten people in that yawl would have had very little chance of survival in the open Atlantic.
What Still Doesn't Add Up
Even this leading theory, the strongest one this case has ever produced, doesn't close every gap. It doesn't fully explain why the ship's last log entry was dated a full nine days before the Dei Gratia found her, a long gap for a supposedly sudden, single emergency. It doesn't perfectly account for every detail of exactly how the crew's belongings were left behind. And by its nature, a theory built this many decades after the fact, from indirect physical and documentary evidence, can never quite reach the certainty of an actual eyewitness account, of which this case, notoriously, has none.
What it does offer, more than a century and a half later, is something the Gibraltar inquiry never managed to produce: an explanation grounded in physical science and documented evidence rather than a Victorian prosecutor's imagination, or a novelist's invention. Whether it's the final word on the Mary Celeste is something historians are still, even now, not entirely willing to agree on.
Read the Full Mary Celeste Investigation Series
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