8 Explorers Who Mysteriously Disappeared (and Some Who’ve Been Found)

A statue of Gaspar Corte-Real
A statue of Gaspar Corte-Real

By their very nature, explorers often push the boundaries of survival in the name of glory, so it’s not a great surprise that many have gone missing in the course of their adventures. Over the years, the quest to uncover the truth of what happened to them has captivated the public, historians, and journalists alike, leading to numerous theories and some surprising finds.

1. Gaspar and Miguel Corte-Real

The youngest of three Portuguese brothers, Gaspar Corte-Real was a keen explorer who undertook an expedition to Greenland in 1500. He embarked on a second expedition in 1501 with his older brother Miguel, in which they claimed Greenland for the crown before apparently sailing on to reach Newfoundland or Labrador. At that point, Gaspar sent two of his three ships back to Portugal, including the one captained by his brother. Gaspar’s ship continued its explorations, but was never seen again.

In 1502, Miguel Corte-Real, learning of his brother’s disappearance, led a search party to the area where Gaspar was believed lost, but he found nothing, and his ship too went missing. The oldest Corte-Real brother, Vasco Annes, begged the king to let him mount a further search party to find his lost brothers, but the king refused—perhaps unwilling to risk the embarrassment of losing a third Corte-Real.

The disappearances have remained a mystery for centuries. But in the 1910s, Edmund Burke Delabarre, a psychology professor at Brown University, put forward a new theory about the inscriptions on the famous Dighton Rock in Massachusetts. The rock is covered with petroglyphs that were first noted way back in 1680, and since then scholars have proposed numerous theories about who carved them and why. Delabarre suggested that the inscription was in fact abbreviated Latin, and reads: “I, Miguel Cortereal, 1511. In this place, by the will of God, I became a chief of the Indians.” This astounding theory implies that the explorer may have continued his travels into America and survived at least nine years in the New World. If his inscription is to be believed, he made quite a success of his new life.

2. Jean-Francois De Galaup

La Perouse's last letter
La Perouse's last letter

Jean-Francois de Galaup, Comte de la Pérouse, was an accomplished sea captain. In 1785, inspired by the successes of Captain James Cook, the French king Louis XVI sent La Pérouse on an expedition to explore the Pacific. The party was made up of two ships—La Boussole and L'Astrolabe—manned by 225 crewmembers. The voyage was expected to last four years. La Pérouse kept scrupulous records of his findings during the trip, mapping coastlines, taking specimens, and making observations of the peoples and places he encountered. (Thankfully, he sent his journals back to France, where they were preserved for posterity and later published to great success.) Having successfully sailed through the Pacific, taking in Japan, the Philippines, and Tonga, La Pérouse arrived at Botany Bay in Australia and was witnessed by British settlers sailing out of the bay in March 1788, the last sighting of the expedition. By 1791, when no communication had been received from La Pérouse for some time, a search party was dispatched from France—but no trace of the expedition was found.

The puzzle seemed to be solved in 1826 when an Irish sailor, Peter Dillon, came across something intriguing while exploring the Solomon Islands. The locals had a number of European swords, which Dillon thought might have belonged to La Pérouse, and told of sighting two large ships that had broken up on the reefs there. In 1964 the wreck of La Boussole was at last discovered on the reefs of Vanikoro in the Solomon Islands, confirming that this indeed was where the expedition had reached its sad end. However, in 2017 an Australian researcher found an 1818 account by an Indian castaway that seems to suggest La Pérouse was killed by locals on a small island off Northern Australia, perhaps in a later leg of his voyage after constructing a schooner from the remains of La Boussole.

3. Naomi Uemura

Japanese explorer Naomi Uemura in 1974
Japanese explorer Naomi Uemura in 1974
Keystone/Hulton Archive/Getty Images

Modern explorer and adventurer Naomi Uemura was part of the first Japanese team to scale Mount Everest in 1970. (He would have been the first Japanese person to reach the summit if his impeccable manners hadn’t made him relinquish the lead to allow his elder, Teruo Matsuura, the honor of going first.) Uemura completed many amazing feats during his lifetime, including climbing the highest mountain on each of the world’s continents solo, trekking across the Arctic to become the first person to reach the North Pole solo, and rafting down the Amazon. In February 1984, Uemura set off to scale Mount McKinley in Alaska in an attempt to become the first person to achieve a solo winter climb of the treacherous peak. Uemura reached the peak, but that is all we know, as he never made it off the mountain. Rescue parties searched for the adventurer, but all that was found was some equipment and his diary hidden in a snow cave. To date his body has not been found, and the exact circumstances of his tragic death remain a mystery.

4. Percy Fawcett

British soldier, archaeologist and explorer Percy Fawcett
British soldier, archaeologist, and explorer Percy Fawcett
Topical Press Agency/Hulton Archive/Getty Images

In the last 90 years, some 13 expeditions and over 100 people have perished in futile attempts to discover the fate of British explorer Colonel Percy Harrison Fawcett. Fawcett was the very epitome of a dashing explorer: He had a distinguished military career before following his sense of adventure to help create maps of the vast and uncharted Amazon jungle. During the 1920s, he departed on a number of ambitious expeditions in an attempt to locate the fabled lost city of El Dorado, which he dubbed the city of “Z.”

In 1925 Fawcett set off into the Mato Grosso region of Brazil with his eldest son, Jack, and his son’s best friend, Raleigh Rimell. The trio plowed into the jungle, covering up to 15 miles in a day in their zeal to find the rumored riches of the lost city. By May 29 the group sent their native guides back with their latest letters, including one to Fawcett’s wife, Nina, in which he wrote: “You need have no fear of any failure.” This missive was the last thing heard of Fawcett, and after two years with no sign, the Royal Geographical Society sent the first of many search parties. That no trace was discovered of Fawcett only served to keep the many rumors surrounding his fate alive.

Researchers have since come forward with many different theories: Fawcett had “gone native” and was living among a remote tribe; he succumbed to malaria or a jaguar attack; he deliberately disappeared in order to set up a mystical commune. But perhaps the most believable version of his fate was obtained by journalist David Grann, who retraced Fawcett’s steps in 2005 and discovered the Kalapalo Indians had an oral history indicating that Fawcett had ignored their advice and walked right into the domain of a hostile tribe who, in all likelihood, killed him.

5. George Bass

George Bass was an English surgeon who, inspired by tales of Pacific exploration, took to the seas as a ship’s surgeon. He embarked on many expeditions, but the one for which he is most remembered is his voyage to Australia with Matthew Flinders in the 1790s. The pair mapped large swathes of the Australian coast, and Bass identified the body of water between Australia and Tasmania that was later named the Bass Strait in his honor. Despite his success as an explorer, Bass felt under-appreciated and became envious of the merchants who were making their fortunes shipping goods from Europe to the new settlements in Australia. Consequently, he abandoned his cartography and set himself up as a trader. Unfortunately he was a little late to the party and when he returned to Australia, his ship laden with goods, he discovered many others had beaten him to the punch and the market was saturated with British products.

Undeterred, he decided to try his luck in South America and set sail with his bounteous cargo in 1803. Bass and his ship were never seen again, and their fate remains an enigma. Rumors persisted that Bass made it to Chile or Peru, where he was captured by the Spaniards and forced to work in the mines there as a slave until his death.

6. George Mallory

George Mallory was a British explorer and mountaineer who captured the public’s imagination after he was asked why he wanted to climb Everest and he responded: “Because it’s there.” As one of the foremost mountaineers of his day, Mallory was an obvious choice to take part in the first British expeditions to the as-yet-unconquered Everest throughout the early 1920s—well before the benefit of modern materials, technology, and weather forecasting.

In June 1924, George Mallory and fellow mountaineer Andrew Irvine set off for an attempt on the summit. Another member of the expedition glimpsed them climbing at over 26,800 feet, but that was the last time they were seen alive. That the pair perished in their attempt was certain, but debate raged over whether they had become the first to reach the summit and died on their way down, or if they died having never reached the top. Various pieces of the puzzle emerged over time—in the 1930s, Irvine’s ice axe was discovered at 27,700 feet, and in 1991 a 1920s oxygen canister was found. Finally, in 1999, an expedition discovered Mallory’s frozen body on the mountainside, clearly the victim of a terrible fall. The climbers carefully buried the body where they found it, but sadly no trace was ever found of Andrew Irvine.

It was hoped that Mallory’s camera might be found—an artifact that could prove for certain if he made it to the summit—but unfortunately the camera remains missing. Tantalizingly, Mallory had stated that he was going to carry a photograph of his wife and leave it at the summit, and when Mallory’s body was found the photograph was not there, providing yet another clue that perhaps this great mountaineer had conquered the world’s tallest mountain.

7. Sir John Franklin

Sir John Franklin circa 1830
Sir John Franklin circa 1830
Hulton Archive/Getty Images

One of the foremost explorers of the Victorian era was Sir John Franklin, who had captained a number of expeditions to the Arctic in search of the Northwest passage. Franklin succeeded in mapping large areas of coastline, identifying many new botanical specimens and furthering our knowledge of the unforgiving Arctic weather during his first two expeditions. Some 20 years after he had retired, Franklin was tempted back to make one final effort to find the Northwest Passage. In 1845, when Franklin was 60 years old, he set off with 129 crewmembers in HMS Erebus and HMS Terror. The ships made it to Baffin Island, where they were sighted by a whaling ship, but after that the ships were seen no more.

With no word from the expedition, numerous rescue missions were sent out to try and discover their fate. Finally, in 1859, after a tip-off from local Inuit hunters, a team led by Francis McClintock found objects and remains from the group on King William Island. It became clear that the two ships had become hopelessly trapped in the sea ice. A note was found which indicated that the ships had finally been abandoned in April 1848, having been stuck fast in the ice since September 1846. The note also revealed that Franklin had died in June 1847, though no cause was given. Scientific analysis of the mummified remains of some of the sailors indicated they may have died from lead poisoning, likely caused by the lead used to seal their canned food. Historians argue that those who did not die from contaminated supplies probably perished in the freezing conditions as they tried to march across the ice to safety. In September 2016, archaeologists announced the discovery of the wrecked remains of HMS Terror off the coast of King William Island, which historians hope will provide yet more clues about the terrible fate of the stranded crew and their desperate struggle for survival.

8. Ludwig Leichhardt

Ludwig Leichhardt, German explorer
Ludwig Leichhardt, German explorer
Hulton Archive/Getty Images

In 1848, German scientist and explorer Ludwig Leichhardt led an attempt to cross Australia’s desert interior from east to west. Leichhardt was already an explorer of some renown, having completed two earlier expeditions across Australia—on one occasion, he had been given up for dead after he spent 18 months in the Australian interior, only to show up very much alive and with copious notes and discoveries.

Leichhardt set off for his final mission accompanied by seven companions, 50 bullocks, 20 mules, seven horses, and a huge amount of supplies and equipment. Despite all of that, the only trace ever found of the missing expedition was a small brass plaque inscribed with Leichhardt’s name and the year 1848, which had been attached to his rifle. The lack of any further evidence of the bodies or equipment from the expedition has proved an enduring mystery, and things aren’t made any clearer by the fact that no one is sure which route they took or how far through Australia’s vast interior they got.

An 1852 search party reported that they had found an abandoned campsite with a tree with the letter L carved into it, a mark Leichhardt reportedly frequently left to indicate his route. Over the years a number of further searches uncovered more trees inscribed with an L, but their disparate locations did little to solve the riddle of the progress and fate of the explorers. The public was so intrigued by the mysterious disappearance that numerous rumors were published in the newspapers, inevitably leading to sensationalist stories of the group dying of thirst, being murdered by Aboriginal people, or even of Leichhardt surviving into old age living in the bush. However, until some concrete evidence or remains are discovered, it is likely that the truth will remain elusive.

This story first ran in 2016.

6 Strange Maritime Mysteries

Neville Mountford-Hoare/iStock via Getty Images
Neville Mountford-Hoare/iStock via Getty Images

The oceans cover over 70 percent of our planet, so it's little wonder that their seemingly impenetrable depths have provided a series of fascinating mysteries, from missing ships to eerie monsters. Below are six mysteries of the deep—some of which scientists think they've at least partly explained, while others remain truly puzzling.

  1. The Mary Celeste

On December 5, 1872, the crew of the British ship the Dei Gratia spotted a vessel bobbing about 400 miles off the coast of the Azores. They approached the Mary Celeste to offer help, but after boarding the ship were shocked to find it completely unmanned. The crew had disappeared without a trace, their belongings still stowed in their quarters, six months' worth of food and drink untouched, and the valuable cargo of industrial alcohol still mostly in place. The only clues were three and a half feet of water in the hold, a missing lifeboat, and a dismantled pump. It was the beginning of an enduring mystery concerning what happened to the crew, and why they abandoned a seemingly sea-worthy vessel.

Numerous theories have been suggested, including by crime writer Arthur Conan Doyle, who penned a short story in 1884 suggesting the crew had fallen victim to an ex-slave intent on revenge. A more recent theory has pointed the finger at rough seas and the broken pump, arguing they forced the captain to issue an order to abandon ship. Since the missing crew have never been traced, it seems unlikely that there will ever be a satisfying answer to the enigma.

  1. The Yonaguni Monument

An underwater area known as the Twin Megaliths at the Yonaguni Monument
An area known as the Twin Megaliths at the Yonaguni Monument
Vincent Lou, Wikimedia // CC BY 2.0

In 1986, a diver looking for a good spot to watch hammerhead sharks off the coast of the Ryukyu Islands in Japan came across an extraordinary underwater landscape. The area reportedly looked like an ancient submerged village, with steps, holes, and triangles seemingly carved into the rocks. Ever since it was first discovered, controversy has surrounded the site that's become known as the Yonaguni Monument, with some researchers—such as marine geologist Masaaki Kimura—arguing it is a clearly manmade environment, perhaps a city thousands of years old and sunk in one of the earthquakes that plagues the region. Others believe it's a natural geological phenomenon reflecting the stratigraphy (layers) of sandstone in an area with tectonic activity. The area is open to scuba divers, so the really curious can strap on air tanks and decide for themselves.

  1. The Bermuda Triangle

The Bermuda Triangle has probably spawned more wild theories, column inches, and online discussion than any other ocean mystery—more than 50 ships and 20 aircraft are said to have vanished there. Although the triangle has never officially been defined, by some accounts it covers at least 500,000 square miles and lies between Bermuda, Florida, and Puerto Rico.

The mystery first caught the public imagination in December 1945 when Flight 19, consisting of five U.S. Navy TBM Avenger torpedo bombers and their 14 crewmembers, were lost without a trace during a routine training operation in the area. Interest was further piqued when it was later reported that one of the search-and-rescue planes dispatched to find the missing team had also disappeared. Articles and books such as Charles Berlitz’s The Bermuda Triangle, first published in 1974 and having since sold over 20 million copies in 30 languages, have served to keep the mystery alive, providing potential theories both natural and supernatural. Scientists—and world-renowned insurers Lloyd’s of London—have attempted to debunk the myth of the Bermuda Triangle, offering evidence that the rate of disappearance in the vast and busy triangle is no higher than other comparable shipping lanes, but such is the power of a good story that this is one story that seems likely to continue to fascinate.

  1. The Kraken

A model of a giant squid on display at the Natural History Museum in London in 1907
A model of a giant squid on display at the Natural History Museum in London in 1907
Topical Press Agency/Getty Images

For hundreds of years, sailors told tales of an enormous sea creature with huge tentacles known as the Kraken. Stories around the mythical kraken first started appearing in Scandinavia in the 12th century, and in 1555 Swedish cartographer Olaus Magnus provided an account of a sea creature with “sharp and long Horns round about, like a Tree root up by the Roots: They are ten or twelve cubits long, very black, and with huge eyes.” The stories persisted, often mentioning a creature so large it resembled an island. In his 1755 book The Natural History of Norway, Danish historian Erik Ludvigsen Pontoppidan described the kraken as “incontestably the largest Sea monster in the world."

Scientists have proposed that these stories might derive from sightings of giant squid (Architeuthis dux), although evidence for an even larger, yet extremely elusive, colossal squid (Mesonychoteuthis hamiltoni) has also come to light. The colossal squid is found in the deepest part of the Southern Ocean surrounding Antarctica, and is thought to be up to 46 feet long and 1100 pounds. The problem is that the animal is so rare very few specimens have been found intact, and no live specimen has ever been observed, which means that estimating its exact size is difficult. Researchers have also noticed that sperm whales have been observed with large scars, and have suggested that these could be the result of violent encounters with the colossal squid, which is known to have sharp rotating hooks on the ends of their tentacles.

  1. The Treasure of the Merchant Royal

The remains of the Merchant Royal are known as one of the richest shipwrecks ever. The ship set sail from the New World in 1641 laden with 100,000 pounds of gold, 400 Mexican silver bars, and thousands of precious gems—in total, a haul thought to be worth $1.3 billion today. The ship got caught in a storm and was thought to have gone down somewhere off the coast of Cornwall, England. The lost wreck became known as the “el Dorado of the seas” due to the enormous value of its cargo, and over the years numerous treasure hunters have searched fruitlessly for its final resting place, which remains undiscovered. In 2019 fishermen snagged what is thought to be the anchor from the Merchant Royal, but to date the dangerous conditions and extreme depths at which the wreck is thought to lie have meant it has remained unclaimed.

  1. Attack of the Sea Foam

In December 2011, residents of Cleveleys, England, awoke to what appeared to be a soft blanket of snow. But as locals ventured out into the streets it soon became clear that this was no snowstorm, but instead something far more puzzling. Trees, cars, roads, and houses were all wrapped in a thick, white layer of foam. The Environment Agency were quickly deployed to take samples of the sea foam, since residents were understandably concerned as to the origin of the strange, gloopy substance, fearing it might be caused by pollutants.

The dramatic images of the foam-soaked town soon had journalists flocking to the region to investigate the phenomena, but as quickly as it appeared the foam disappeared, leaving behind only a salty residue. Scientists analyzing the foam confirmed it was not caused by detergents, and instead suspected that it was caused by a rare combination of decomposing algae out at sea and strong winds, which whipped up the viscous foam and blew it into land. The phenomena has apparently occurred at other times before and since, and researchers are now working to try and understand the exceptional conditions that cause it to form so that residents can be warned when another thick blanket is set to descend.

Bonus: The Bloop—Mystery Solved

Over the years, the oceans have produced a number of eerie and often unexplained sounds. In 1997, researchers from NOAA listening for underwater volcanic activity using hydrophones (underwater microphones) noticed an extremely loud, powerful series of noises in the Pacific Ocean. The unusual din excited researchers, who soon named it “The Bloop” in reference to its unique sound.

Theories abounded as to the origin of the bloop—secret military facility, reverberations from a ship’s engine, or an enormous sea creature. The most fanciful suggestion stem from H. P. Lovecraft fans who noticed that the noise came from an area off South America where the sci-fi writer’s fictional sunken city of R’lyeh was supposed to be. They proposed that the bloop might have originated from Lovecraft’s “dead but dreaming” sea creature, Cthulhu. In 2005, however, scientists found that the mysterious sound was in fact the noise made by an icequake—or an iceberg shearing off from a glacier.

Death at the South Pole: The Mystery of Antarctica's Unsolved Poisoning Case

Amundsen-Scott South Pole Station in Antarctica
Amundsen-Scott South Pole Station in Antarctica
Chris Danals, National Science Foundation

Rodney Marks was walking from a research building to the main base at the Amundsen-Scott South Pole Station when he started to feel strange. This wasn't the normal weirdness people deal with when adjusting to the -80°F temperatures and 24-hour nights of Antarctic winters. The 32-year-old astrophysicist was struggling to breathe. Soon, his vision became weak. He was also very tired and went to bed early, hoping to sleep off whatever mysterious sickness was plaguing him.

But sleep didn't help. Instead, things just got worse—much worse. At 5:30 a.m. the morning of May 12, 2000, Marks woke up vomiting blood. He went to the station's doctor, Robert Thompson, three times over the course of the day, and with each visit, his symptoms appeared to grow more excruciating. Pain burned through his joints and stomach. His eyes were so sensitive that he had to wear sunglasses even though the sun hadn't risen over the base in several weeks. As his physical condition deteriorated, so did his mental state: He became so agitated that the doctor wondered if anxiety wasn't the cause of his symptoms.

When Marks visited the physician the third time that day, he was distressed to the point of hyperventilation. Thompson injected him with an antipsychotic to calm him down. Marks laid back and his breathing slowed. To the untrained observer, it may have looked as though he was getting better.

But that's not what was happening. Shortly after receiving the shot, Marks went into cardiac arrest, and after 45 minutes of unsuccessful resuscitation attempts, Thompson declared him dead at 6:45 p.m.

As soon as the fight to save his life ended, the 49 people living at the base were faced with a new problem: a dead body in one of the most remote places on earth, at a time of year when it was too cold for planes to land. It would be months before an aircraft was able to collect Marks's remains—and years before it was revealed that there was a chance he had been murdered.

Crime and Death in Antarctica

Death is rare in Antarctica, but not unheard of. Many explorers perished in the late 19th and early 20th centuries in their quests to reach the South Pole, and potentially hundreds of bodies remain frozen within the ice. In the modern era, more Antarctic fatalities are caused by freak accidents. Three scientists were riding a Muskeg tractor across the tundra in 1965 when the vehicle plunged into a crevasse, killing everyone on board. In 1980, Amundsen-Scott Station cook Casey Jones died while attempting to clear snow from a shaft in a fan room when the packed snow collapsed and crushed him.

There's also a history of violence on the continent. According to one unconfirmed story reported in Canadian Geographic, a scientist working at Russia's Vostok Station in 1959 snapped after losing a chess game and murdered his opponent with an axe. (Chess was supposedly banned from Russia's Antarctic bases after that.) More recently, in October 2018, a Russian scientist working in Antarctica allegedly stabbed his colleague following a possible nervous breakdown.

With some of these crimes, the Antarctic setting itself may have played a role. Scientists living in Antarctica are forced to share cramped quarters with the same group of people for months at a time. Contact with the outside world is limited, and depending on the weather, going for a walk to clear the mind isn't always an option.

"You're far away from home. You're far away from the people that form your normal social network. You're isolated with a group of people you didn't choose," Peter Suedfeld, a psychologist at the University of British Columbia who has studied the effects of Antarctic isolation on the mind, tells Mental Floss.

The extreme isolation there is rivaled only by what astronauts experience in space—in fact, space agencies conduct studies in Antarctica to simulate their long-term missions.

On top of dealing with boredom and claustrophobia, researchers in Antarctica are adjusting to either constant day or night. When someone's circadian rhythm—the biological system governed by the 24-hour day—is disrupted, the negative effects are felt in both the body and mind. According to one study, people on disrupted circadian cycles are more likely to exhibit aggressive behaviors.

"Because of the environment, people do get irritable, sensitive, maybe quicker to take offense at something that wasn't meant to be offensive," Suedfeld says. "I think it's fascinating that there hasn't been more violence in Antarctica."

A Belated Autopsy

Rodney Marks was already familiar with the stressors of life in Antarctica when he signed up to work there from 1999 to 2000. The Australian native had previously wintered on the continent from 1997 to 1998 as part of the Center for Astrophysical Research in Antarctica (CARA)'s South Pole Infrared Explorer project. Dr. Chris Martin, one of the researchers who worked on the project with Marks, told the New Zealand Herald: "Rodney liked it so much he wanted to go back again."

For his second stay, he worked on the Antarctic Submillimeter Telescope and Remote Observatory project as a researcher for the Smithsonian Astrophysical Observatory. His job consisted of collecting data with a massive infrared telescope and using it to improve viewing conditions at the South Pole. Antarctica is considered one of the best places on Earth to study space, and his work enabled astronomers to make important observations.

Marks charmed his colleagues with his bohemian style and friendly personality. He joined the base band, Fannypack and the Big Nancy Boys, and was dating maintenance specialist Sonja Wolter. Darryn Schneider, the only other Australian at the base that winter and Marks's friend, described him in a blog post: "His dry wit was sometimes misinterpreted here by the people not used to it. This is where his considerate nature and his kindness would come out. I saw him numerous times make amends in a very nice way for these misunderstandings. He would also say or do something kind for someone having a hard time in general."

So when he died suddenly that May, roughly six months into his second journey at the pole, it shocked the researchers and technicians at Amundsen-Scott Station. The station doctor, Robert Thompson, told the young man's colleagues that Marks had died of unknown but natural causes, likely a massive heart attack or stroke. Because it was Thompson's job to treat live patients, not perform autopsies, they would have to wait to learn any more details.

With months of unbroken darkness and dangerous cold stretched out before them, October was the soonest it would be safe for aircraft to land at the South Pole. In the meantime, people living at the base used the excess hours in their days to gather oak scraps and cut and polish them into a casket. They loaded Marks's body into the makeshift coffin and laid him to temporary rest in the base's storage, where the frigid climate would preserve his remains until the end of winter.

On October 30, a plane transported the body from Amundsen-Scott Station to Christchurch, New Zealand, where forensic pathologist Dr. Martin Sage finally was able to perform an autopsy. The amount of time that had passed between the death and the examination didn't stop Sage from making a disturbing observation: Marks hadn't died of natural causes after all. According to the post-mortem, he had ingested approximately 150 milliliters of methanol—roughly the size of a glass of wine. Methanol is a type of alcohol used to clean scientific equipment in Antarctica: It's subtly sweet, colorless, and toxic even in small amounts—which means a fatal dose could easily be slipped into someone's drink without their knowledge.

That left a limited number of options on the table. To the people who lived and worked with Marks up until his final hours, the possibility that he had killed himself was hard to believe. He had thrived in the harsh beauty of Antarctica. He was doing important research at the observatory, and when he wasn't working, he had his friends and Wolter, whom he had planned to marry, to keep him company. But if Marks hadn't poisoned himself, that left his colleagues with the unsettling possibility that they had shared a home with a murderer for over half a year.

An Inconclusive Inquest

Because Antarctica is governed by a treaty signed by 54 nations, handling crimes there can be a headache. Marks was from Australia and had worked for an American station, but he died within the Ross Dependency—a territory of Antarctica claimed by New Zealand. By October, New Zealand had taken over the job of looking into the incident.

While the coroner of Christchurch began an initial inquest in 2000, the investigation took years to complete, and involved several hearings. Detective Senior Sergeant Grant Wormald looked at four possible causes of death: Marks drank the methanol accidentally; he drank it for recreation; he drank it to kill himself; or someone else had spiked his drink. In 2006, Wormald stated that suicide was the least likely explanation for the young scientist's death, citing his promising career and relationship.

It was more plausible that Marks had ingested the solvent to get high and accidentally overdosed. He was a heavy drinker, and had been known to use alcohol to cope with his Tourette's syndrome. But Wormald saw this as further evidence that he hadn't drunk the methanol on purpose: Marks had access to plenty of alcohol on the base if he was looking to self-medicate, and as an experienced binge-drinker, he would have known the risk of drinking unfamiliar substances. When he did get sick, he acted just as bewildered as the rest of the crew, suggesting he had no idea there was poison inside his body.

Wormald concluded: "In my view it is most likely Dr. Marks ingested the methanol unknowingly." But how exactly the methanol got into Marks's system—and if it wasn't an accident, who might have given it to him—remained a mystery.

According to The New Zealand Herald, some experts were critical of Robert Thompson's treatment of Marks in his final hours. William Silva, who had been a physician at a nearby Antarctic station, reviewed Thompson's medical notes from that day and questioned certain aspects of his care. Thompson had access to an Ektachem blood analyzer, a machine that would have detected the dangerous levels of methanol in his patient's system and likely prompted the doctor to take steps toward appropriate treatment. But the lithium-ion battery had died some time before, which meant that turning it off reset its electronic memory. It was shut off the day of Marks's death, and to power it back up, Thompson would have needed to recalibrate it—a process that takes 8 to 10 hours [PDF].

Thompson later testified that he had been too busy caring for Marks to use the Ektachem. He also said that the machine was difficult to use and maintain—a claim that Silva disputed. According to Silva, the Ektachem "is quite straightforward," and Thompson could have called the manufacturer's free technical support line if he was having issues with it (though telephone service was spotty at best).

Thompson never provided a response to Silva's testimony. He was impossible to get in touch with during the later stages of the inquest, having seemingly fallen off the grid. He was never charged with any wrongdoing. (Thompson could not be reached for comment.)

The National Science Foundation (NSF), the U.S. organization that runs the Amundsen-Scott Station, reportedly did little to make matters clearer. When Wormald asked for reports on Marks's death, the NSF reportedly wasn't forthcoming, saying it didn't have any reports that were relevant to his investigation. The foundation also reportedly ignored his requests when he asked for the results of lab tests conducted on the scant evidence gathered from Marks's room and work station before they were cleaned.

The NSF denies Wormald's characterization of how it handled the investigation. In a statement to Mental Floss, a representative said: "[The] NSF consistently cooperated with the Christchurch coroner's office and New Zealand Police to address this tragic situation. Dr. Marks was an important member of the Antarctic research community. NSF continues to extend its deepest condolences to his family, friends and colleagues."

But according to Wormald, any useful information he pried from the government agency was the product of his own persistence. Only after being pestered by the detective, he said, did the NSF agree to send out a questionnaire to the 49 crew members who had been at the station at the time of Marks's death. The foundation vetted the questions first, "to assure ourselves that appropriate discretion has been exercised," and when they were finally mailed out, they came with a note saying participation wasn't mandatory. Only 13 of Marks's 49 colleagues responded.

A Tragic Accident—Or The Perfect Crime?

Without much cooperation from the National Science Foundation and with no solid leads, the investigation failed to move forward. It fizzled out completely in 2008 when coroner Richard McElrea released a report saying that no conclusions could be drawn one way or the other about the circumstances surrounding Marks's poisoning. Referencing a 2000 report [PDF] based on the medical notes about the case that said there was no reason to suspect homicide or accidental poisoning, McElrea wrote, "I respectively [sic] disagree that accidental poisoning and even foul play can be adequately disregarded without a full and proper investigation." His main takeaway was that the disorganization of the case indicated "an urgent need to set comprehensive rules of investigation and accountability for deaths in Antarctica on a fair and open basis."

Outside of true crime internet forums, a clear idea of what happened to Marks has never emerged. He didn't have any known enemies at Amundsen-Scott Station, and there was no evidence implicating any of the workers at the base with a crime.

With the inquiry into his death producing more questions than answers, Rodney Marks's story occupies a strange place in the history of Antarctic tragedies. Driving on approved routes may reduce the risk of falling into a crevasse—and banning chess may stop game-related fights—but this particular incident left no obvious path toward preventing ones like it from happening in the future. It's not even clear whether Marks's death should be grouped with Antarctica's freak accidents or rare acts of violence.

As of 2019, there's still no system in place for handling homicides that happen on the continent. With so many territorial claims, and some that even overlap, the general rule is that jurisdiction falls to the home country of the person who committed the crime and the station where it took place. That means if a Russian researcher assaults someone at a Russian station, as was the case in October 2018, the case is handled by Russian authorities. But things get stickier if an American commits a crime on a Russian base, in which case both countries could have a claim to the investigation. Situations where an apparent crime produces a body and no obvious perpetrator are, of course, even more complicated.

Until Marks's death, that was an issue the nations working in Antarctica had never had to face. There still has never been a trial for a murder that happened on the continent—though the question of whether murder has been committed there remains unanswered.

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