Scientists Finally Solved the Loch Ness Monster Mystery — And the Answer Is Bizarre

Añadido: 2026-05-28

[00:00:00]I just noticed a small dark shape just out of the corner of my eye.

[00:00:05]>> We saw this great neck emerge from the water and then there was the long neck and you could see the tree.

[00:00:12]>> Scientists finally solved the Loch Ness monster mystery and the answer is bizarre. Not a pleasur, not a hoax, not a log, not a seal, not a trick of the light. Something else. Something that has been hiding in plain sight in the dark water of one Scottish lake for 1500 years. And it took a geneticist from the other side of the planet, 250 bottles of lake water, and a technology that did not exist a generation ago to drag the truth out.

[00:00:38]>> Is there a plesiosaur in locks? No.

[00:00:42]There is absolutely no evidence of any reptilian sequences in our sample.

[00:00:46]>> It is not what the believers wanted. It is not what the skeptics expected. It is stranger than both.

[00:00:54]The lake that should not exist here is what makes this lake different.

[00:00:59]Loch Ness is the second largest freshwater body in Scotland. 23 mi long, 755 ft at its deepest point, more fresh water than every lake in England and Wales combined. And it sits on a geological wound that has been bleeding for 400 million years. That wound has a name, the Great Glenn Fault. 62 miles of active tectonic scar slicing diagonally across the Scottish Highlands from Inesse in the northeast to Fort William in the southwest. The fault is not dead.

[00:01:32]Microismic activity is recorded along its length on a regular basis. The lake itself was carved by glaciers that followed the fault during the last ice age, gouging a trench in the weakened bedrock that filled with melt water and never emptied. Now, here is the part nobody talks about. Below 100 meters, Loch Ness goes black, permanent darkness. Sunlight cannot reach it. The temperature holds at 5 to 6° C year round, regardless of what is happening at the surface. And the water is dark long before you go deep. The lakes's watershed drains through massive pete deposits in the surrounding highlands.

[00:02:09]And the runoff carries dissolved organic compounds that stain everything brown, the same chemistry that gives Scottish whiskey its color when aged in oak.

[00:02:18]Visibility at the surface is measured in feet. At depth, it approaches zero.

[00:02:23]Divers describe a featureless black void with no horizon and no reference points.

[00:02:29]A creature could live in this water for a thousand years and never be clearly seen. A whole population of them could.

[00:02:36]And for nearly a century, that is what people assume was happening. Until a man from New Zealand showed up with 250 empty bottles and a theory that did not require seeing anything at all. In two days, I get on a plane and I'm going to Loch Ness and I'm going to start a new project using environmental DNA technologies to look for evidence of uh what lives in Loch Ness and we might even find a monster.

[00:03:01]A saint and a road.

[00:03:04]The legend predates the modern story by more than a millennium. Around the year 565 AD, an Irish missionary named Columba was traveling through Pictish country in northern Scotland. According to a biography written about a century after his death, Columba encountered a water beast in the river Ness, the short waterway that connects the lake to the Mo FTH. The creature had reportedly killed a man. Columba commanded one of his followers to swim across the river as bait. When the beast surged from the water to attack, Columba raised the sign of the cross and ordered it to retreat.

[00:03:38][music] It obeyed. That account sat in ecclesiastical archives for a thousand years. It did not create the modern phenomenon, but it established something. The association between this lake and an unidentified creature predates the Daily Mail by more than,300 years. And it sat inside a much older Highland tradition of water spirits, the Kelpy, the shape-shifting horse that lured travelers to drown in dark water.

[00:04:05]Stories told across Scotland long before anyone outside the Highlands had ever heard the name Nessie. The cultural framework was already there. The people who lived along this lake had been describing something in the water for generations. And here is where it gets stranger. Down on the southern shore of Loch Ness at this exact moment, there is a man living in a converted mobile library. His name is Steve Felum. In 1991, he gave up his job. He sold his house. He moved to the lake and started watching the water every single day. He has been doing it ever since. 30 plus years. Guinness World Record for the longest continuous monster hunt.

[00:04:45]>> I saw one thing in the first year of being here. Something just shot across the bay in front of [music] me and you couldn't tell what it was. You could only see a spray of water coming off of something like a torpedo.

[00:04:59]>> He is still there. He is still watching.

[00:05:02]And he is going to matter at the end of this story in a way you will not expect.

[00:05:07]What changed in 1933 was not the stories. It was who could hear them. The A82 road along the northern shore of Loch Ness was completed that year.

[00:05:16]Before the road, the terrain was steep.

[00:05:19]The shoreline was rugged and [music] the communities along the water were small, isolated, and largely invisible. The new road changed all of it. Travelers could now drive the full length of the lake with clear views. On the 14th of April 1933, a couple named Aldi and John McKay were driving along it when they saw something in the water. They described an enormous animal rolling and plunging in the lake. They reported it to Alex Campbell, a water baleiff, who also wrote part-time for the Inesse Courier.

[00:05:50]Campbell published the account on the 2nd of May. He used the word monster.

[00:05:54]Within weeks, the sightings multiplied.

[00:05:57]Within months, the story reached national newspapers. By the end of 1933, Loch Ness was an international sensation. Expeditions were being mounted from London. Headlines were appearing on three continents. The McKay's an [music] ordinary couple driving home on an ordinary afternoon, had just lit the fuse on what would become the most famous unsolved mystery of the modern western world. And one year after that, a photograph appeared that would define the creature for the next 60 years. The problem was the photograph was a lie. a specific targeted, calculated lie built by a man with a grudge. Stay with me here because the man who built the most famous monster photograph in the world did not do it for money. He did it for revenge alone. And if you want to be here when the New Zealand team finally cracks the real answer, hit that subscribe button now. The Edna result at the end is not what either side has been arguing about for 90 years.

[00:06:55]The photograph that lied.

[00:06:58]Marmaduke Weather was a big game hunter.

[00:07:01]In 1933, the Daily Mail hired him to find the monster and bring back proof.

[00:07:06]Weather went up to Loch Ness, looked around, [music] and produced what he claimed were the creature's tracks. The Daily Mail ran with it. Then the British Museum examined the casts and identified them as hippopotamus footprints made with an umbrella stand fitted with a stuffed hippo foot. The mounted base weather was destroyed in print. The newspaper that had hired him turned on him. He went home humiliated and he started planning. On the 21st of April 1934, the Daily Mail published a photograph credited to Robert Kenneth Wilson, a London gynecologist. The image showed a long slender neck rising from the water topped with a small head. The iconic silhouette, >> one of the most iconic photographs ever taken.

[00:07:53]The surgeon's picture of course is [music] a picture which everybody in the western world will know.

[00:08:01]>> Wilson refused to attach his name to it publicly which gave it weight. A respectable medical professional, the implication ran had captured something so controversial he could not openly claim it. The Daily Mail called it the surgeon's photograph. It got reproduced thousands of times. For 60 years, every person who pictured the Loch Ness monster pictured that silhouette. In 1994, Christian Sperling, Weather's stepson, confessed on his deathbed that he had helped build the prop. The creature was a toy submarine bought from a local shop, modified with a sculpted plastic wood head and neck glued on top.

[00:08:38]Weather had staged it. He had fed the fake to the same newspaper that had publicly destroyed him, watched it conquer the world for the rest of his life, and never told anyone. 60 years of revenge running through every souvenir mug, every documentary, every silhouette ever printed. The confession should have ended the mystery. It did not. By 1994, the legend was bigger than any single piece of evidence. Thousands of sightings, decades of investigation, multiple unexplained sonar contacts. The serious science had been underway since the 1960s. Tim Dinsdale, an aeronautical engineer, filmed a hump-shaped object moving across the lake in 1960. The footage was analyzed by the Royal Air Force Joint Air Reconnaissance Intelligence Center, the same unit that interpreted spy imagery during the Cold War. Their conclusion was carefully worded. The object was probably animate.

[00:09:32]Not definitively. Probably. That single word kept the mystery alive for another generation. Then it got stranger. In October of 1987, a naturalist named Adrien Shine ran Operation Deep Scan, deploying 24 boats in formation with overlapping sonar beams sweeping the entire water column from surface to bottom. The operation detected three unexplained contacts, large, deep, moving. Shine did not claim they proved a monster. He said only that the contacts remained unexplained.

[00:10:04]>> The team of scientists sweeping the depths of Loch Ness said tonight they'd made sonar contact with a large unidentified object.

[00:10:13]>> In 2003, the BBC ran a sweep with 600 simultaneous sonar beams and detected nothing. The BBC declared the mystery [music] solved. But Loch Ness is one of the most acoustically complex freshwater environments on Earth. steep walls, extreme depth, thermal stratification, pete stained sediment. Sonar lies here.

[00:10:35]The BBC may have been right, or [music] the BBC may have missed something that knew how to stay missed. Which is when a population geneticist on the other side of the planet decided to stop chasing the monster entirely.

[00:10:48]The method no one had tried.

[00:10:52]Here is what nobody in 90 years of Loch Ness hunting had thought to do. Neil Gmel of the University of Otago in New Zealand showed up in 2018 with a completely different question. Not where is the monster, not how do we see it, just one question. What is actually in this water? The technique is called environmental [music] DNA, Edna for short. It works on a single biological fact that turns the entire hunt upside down. Every living organism sheds genetic material into its surroundings just by being alive. Every microbe in a body of water is constantly leaving microscopic traces of DNA suspended in that water. Filter the water, extract the DNA, sequence it, compare it against the global genetic database. You get a list of every species that has shed material into that water within the previous few weeks. Whether you ever see it or not, the monster does not have to surface, does not have to be photographed, does not have to be caught on sonar. It only has to be biologically alive somewhere in the lake because if it is alive, it is shedding. And if it is shedding, the DNA is in the bottle.

[00:12:03]GML and his team collected 250 samples across the entire lake at multiple depths. They sealed the samples. They flew them back to New Zealand. [music] They processed them through standard extraction and sequencing protocols. And in September of 2019, the results came back. Picture GML in his lab. The plesiosaur screen runs. The screen returns null. No genetic signature of any large unknown marine reptile anywhere in the lake. Not a trace. 66 million years of legend. The long necked creature gliding through dark water. The survivor of the extinction event. The prehistoric refugee.

[00:12:43]>> Is there a plesiosaur in lockchess? No.

[00:12:47]There is absolutely no evidence of any reptilian sequences in our sample. The species that has dominated the visual imagination of Loch Ness for 90 years.

[00:12:56]Not there. Gml, who had gone in publicly open to the possibility, told the press afterward there was a moment of genuine disappointment. He had hoped to find something. He found something. It just was not what he or anyone else had expected because the screens kept running. No large unknown mammals, no misidentified seals, no exotic aquatic mammal that had somehow established residence. No giant sturgeon. Sturgeon had been one of the more credible scientific candidates for decades. Large primitive fish capable of reaching multiple meters. Several serious investigators had backed the sturgeon hypothesis. The water said no. No sturgeon DNA. None. The entire monster catalog, every candidate that had been proposed seriously across 90 years of investigation, was being eliminated one screen at a time until one signal would not stop coming back. One species so abundant, so distributed, so present at every depth and in every region of the lake that GML could not look at the data and conclude anything else. [music] And what that signal was is where the answer gets genuinely bizarre.

[00:14:06]what the water actually said.

[00:14:10]Environmental DNA from the European eel, Anguila Anguila, was present throughout Loch Ness. Every depth, every region, higher concentration than anyone on the team had expected. The eels were everywhere. In itself, the presence of eels in Loch Ness was not surprising.

[00:14:27]European eels are native to Scottish waters. They are born in the Saraso Sea, drift as larvai across the Atlantic, transform into glass eels and coastal estuaries, and migrate up rivers into freshwater systems where they spend years, sometimes decades, growing before returning to the sea to spawn and die.

[00:14:48]Loch Ness connects to the ocean through the river Ness. It is well within the natural range of the species. What was surprising was the volume of signal. The Edna suggested an eel population denser, more distributed, and more thriving than anyone had reason to expect in a lake this deep and this cold. GML was careful. He did not declare the monster solved. He said only that the data was consistent [music] with the eel hypothesis.

[00:15:14]>> We have no definitive evidence of a monster.

[00:15:16]>> Plausible theory is around eels and the idea there might be a giant eel >> and that the data was not consistent with anything [music] else. Then he said something the press did not fully pick up on. He said the size question was open. He could not rule out from the genetic data alone that some of these eels were considerably larger than any specimen ever documented. And here is where it gets stranger. The eel hypothesis is old. Researchers have proposed it for decades. Most witness accounts describe a long undulating body moving through the water, awake without [music] an obvious source. A hump that appears and then submerges. That description matches eel locomotion far better than it matches the four flippered plesiosaur of popular imagination. The problem has always been size. Classic Nessie sightings describe a creature of enormous proportions. 15 ft, 20 ft, 30 ft. Normal European eels max out at around 5 or 6 ft. So, how do you get from a 5-ft eel to a 30ft monster? The answer when you look at the lakes's biology is that you may not have to. Lock nest is [music] unusual.

[00:16:24]Extreme depth provides refuge from predators. Dark pete stained water provides concealment. A consistent food supply of salmon, trout, and other fish provides nutrition. Stable cold temperatures at depth reduce metabolic demands and slow aging dramatically. And eels are known for extraordinary longevity. A Swedish eel named Ale lived in a single well for 155 years before dying in 2014.

[00:16:50]155 years in a well with limited food.

[00:16:55]If even a small subset of eels in lock nests are achieving lifespans [music] like that, growing slowly but continuously in a refuge environment with no human harvest pressure, individual specimens [music] could reach sizes that have never been documented anywhere in scientific literature. No giant eel has ever been captured from Loch Ness. None has ever been clearly photographed. But the Edna gives us the first hard genetic evidence that the eels are there in unusual abundance and that nothing else on the candidate list is there at all, which still does not fully explain the sightings because even an unusually large eel does not look like the thing witnesses keep describing. A hump appearing on flat water, a wake racing across the surface with nothing visible producing it.

[00:17:40]something rising and then vanishing [music] in seconds.

[00:17:44]>> I've seen a large unidentified object. I fished here since I was a quite a young boy and I've never seen anything like it. They came right out of the water in front of me.

[00:17:52]>> Must have been It's difficult to say, but I would say 25 to 30 ft and at the highest point about 5 to 6 ft out of the water.

[00:17:59]>> An eel alone does not produce those visuals. Something else does. Something most people have never heard of. And it is the second half of the answer.

[00:18:07][music] The New Zealand survey could not have caught the answer. No one wanted here is what nobody is saying about Loch Ness. The lake has weather, not surface weather.

[00:18:19]Internal weather. Loch Ness is long and narrow and stratified by temperature.

[00:18:24]Cold, dense water at the bottom, warmer water at the top. a boundary layer in between called a thermocline where the temperature drops sharply over a relatively narrow vertical band. When wind blows hard along the lakes's length, it pushes the warmer surface [music] layer toward one end the way you would tilt water in a long pan. The thermocline tilts with it. When the wind drops, that displaced layer rebounds. It rocks back and it keeps rocking, oscillating along the entire 23 mile length of the lake. Sometimes for days at a time, long after the wind that started it has died down completely.

[00:18:59]Hydraologists call it a ceich. The word is French. It means to sway. A ciche on Loch Ness is not a wave you can see from the shore. It is a wave inside the water. The boundary between cold and warm layers heaves up and down by meters, generating slow rolling pressure pulses that travel the length of the basin like a heartbeat. Most of it happens entirely below the surface. But when those internal pulses reach shallower water near the ends of the lake or collide with bottom topography, they push columns of water upward, they create localized upwellings, surface disturbances that look like something moving through the water without anything visibly producing them. Humps that appear from nowhere, wakes that travel without a source, domes of water that rise for a few seconds and collapse back down as if something had just submerged. [music] Now combine that with the eels. Picture it. The lake is calm. Glass calm. The kind of dead flat surface tourists [music] wait all the week for. A seash from a wind event 3 days ago is still oscillating below the surface, completely invisible from the shore.

[00:20:09][music] An eel much larger than the textbooks say it should be is hunting along the thermocline at 20 or 30 m down. The internal wave reaches the eel's depth. It lifts a column of dark Pete stained water upward toward the surface. The eel riding the upwelling breaks the surface for a few seconds. A witness on the shore half a mile away sees a hump rising out of glassy water with no boat, no animal, no logical explanation in sight. The eel rolls, slides back under, gone. The wake from the upwelling continues for another 10 or 15 seconds, racing across the surface with nothing visible producing it. The witness has just seen the monster.

[00:20:50]>> I just noticed a small dark shape just out of the corner of my eye.

[00:20:56]>> We saw this great neck emerge from the water and then there was the long neck and you could see the tree humps.

[00:21:02]>> The witness has just seen exactly what the McKay's described [music] in 1933.

[00:21:07]Exactly what Tim Dinsdale filmed in 1960. Exactly what hundreds of other witnesses have described across 90 [music] years of sightings. a long shape, a rolling motion, a wake without a source. And here is the bizarre part.

[00:21:22]The witness [music] was not wrong. The witness was not lying, not hallucinating, not seeing a log, not misidentifying a seal. The witness saw two real scientifically documented phenomena collaborating, an internal wave produced by the lake's own thermal physics, and a long lived eel grown to a size that no other freshwater body on Earth seems to produce. Neither one alone makes a monster. Together they do.

[00:21:48]The hump is the eel. The wake is the ceiche. The disappearing act is the upwelling collapsing. The reappearance, sometimes minutes later, sometimes hundreds of [music] meters away, is another upwelling, another rolling eel, another moment of the same machinery doing the [music] same thing. The monster is not a creature. The monster is a collision, a collaboration between the geology of the lake, the chemistry of the water, the physics of internal waves, and the biology of a species that has been quietly winning at Loch Ness for centuries. No single explanation works. Pliosaur does not work. Sturgeon does not work. Eel by itself does not work. All of them layered together in a single lake with a single geological history do. The Loch Ness monster is what happens when one freshwater body offers refuge to an unusual eel population, sits on an active tectonic fault, drains through enough pete to stain the water opaque, runs deep enough to produce internal waves, and gets discovered by a culture already primed to see monsters in dark water.

[00:22:53]Everything you need was already there.

[00:22:55]It just needed a New Zealand geneticist to stop chasing the ghost and start reading the water. This has been a great big science con. You know, we've been talking science the entire time and we've been using the monster as the bait.

[00:23:09]>> That is the answer the EDNA survey [music] pointed toward. That is the answer the field investigators on the ground are still verifying.

[00:23:17]>> [music] >> In August 2023, the Loch Ness Center and Loch Ness Exploration launched the Quest Expedition, the largest monster hunt in 50 years. Deploying thermal imaging drones and hydrophones to capture underwater sound. The drones recorded unusual surface disturbances, the hydrophones picked up unusual underwater sounds, clicks, low rumbles, pulses. The findings were not conclusive on their own, but they fit the eel plus seich model better than they fit anything else. Real biology, real physics, real geology. No prehistoric reptile required. The answer was never one strange thing. It was three ordinary things doing something extraordinary together. Which brings [music] us back to Steve Felam. Still on the shore, still in his converted mobile library, still watching the water everyday after 30 plus years. Felt has seen things he cannot explain.

[00:24:11]>> I saw one thing in the first year of being here. Something just shot across the bay in front of me and you couldn't tell what it was. You could only see a spray of water coming off of something.

[00:24:24]He has watched objects move through the water that did not behave like boats, logs, or any wildlife he recognized. He has never captured proof, but the Edna answer does not make Felt wrong. It makes him [music] right. He was always right that something is out there. He was just wrong like everyone was wrong about what it was. The lake is not hiding a creature. The lake is producing an event and Felton sitting at the edge of it for 30 years is one of a very small number of human beings who has watched that event repeatedly. He just had the wrong word for it. The Loch Ness monster is real. The Loch Ness monster is not a creature. Not exactly. It is an eel large enough to be impossible, riding an internal wave nobody can see, surfacing for a few seconds at a time in water dark enough to hide a battleship.

[00:25:12]It is the strangest, most bizarre answer this lake could have given us. And it was sitting in the water the whole time, waiting for someone to stop looking for a monster and start filtering its DNA.

[00:25:22]Somewhere right now, in the dark, deep pet stained reaches of Loch Ness, a seash is rocking under the surface. An eel that may be older than anyone listening is hunting along the thermal boundary. And in about a minute on a flat patch of empty water, something is going to [music] rise, roll, and disappear. A witness, if there is one, will go home and tell a story. [music] The story will be wrong. The story will also, in its own strange way, be exactly right. Which leaves one last question.

[00:25:52]If a lake this studied, this watched, this surveiled, kept its real secret hidden for 1,500 years, what else are we mistaking for monsters? What other quiet biological truths are we walking past every day? Because the story we tell ourselves is louder than the science.

[00:26:09]Drop your best theory in the comments.

[00:26:11]Strangest, smartest, most haunting one gets pinned to the top of this video.

[00:26:15]And if this is the first time you have heard the cenil answer, share this with the one person in your life who has always believed in Nessie. They deserve [music] to know. The truth was always going to be weirder than the legend itself.