The Loch Ness Monster, or “Nessie,” is the most famous cryptid in the world: a large, long-necked animal said to live in Loch Ness, a deep freshwater loch in the Scottish Highlands. Although its fans trace it back to a saint’s life written around 700 AD, the modern legend began in 1933, when a newspaper report, a new lakeside road and a run of sightings turned a local curiosity into an international sensation. Ninety years of photographs, sonar sweeps, expeditions and, most recently, DNA testing have not produced a monster, but they have produced one of the most thoroughly investigated stories in the history of cryptozoology.[1]
| Location | Loch Ness, near Inverness, Scottish Highlands |
|---|---|
| The loch | About 37 km (23 mi) long; up to about 240 m (788 ft) deep; Britain’s largest lake by volume |
| Earliest claimed account | Adomnán’s Life of St Columba (c. 700), describing an event said to have occurred in 565 |
| Modern legend begins | May 1933, Inverness Courier |
| Most famous photo | The “surgeon’s photograph,” April 1934: a confirmed hoax |
| Key scientific survey | Environmental DNA study led by Neil Gemmell, 2018–19 |
| Leading explanations | Misidentified animals (especially eels), boat wakes, waves, debris and hoaxes |
The loch
Loch Ness lies along the Great Glen, a geological fault that cuts diagonally across the Highlands. It is long, narrow and remarkably deep, about 37 kilometers long and reaching some 240 meters (788 feet) at its deepest, which makes it the largest body of fresh water in Great Britain by volume. Peat from the surrounding hills stains the water dark brown, so visibility is poor just a few meters below the surface. The loch also changes constantly with the wind, producing waves, wakes and standing waves that can travel long distances. All of these features play a part in the monster’s story.[1][6]
The loch is also young. It was carved and filled by glaciers, and the current loch has existed only since the end of the last Ice Age, about 10,000 years ago. Before that it was frozen solid.[1]
St Columba and the water beast
The earliest story usually cited for Nessie comes from Adomnán, abbot of Iona, who wrote a Life of St Columba around 700 AD. In it, Columba, traveling among the Picts in the sixth century, comes to the River Ness and finds people burying a man killed by a “water beast.” He sends one of his followers to swim across; the beast rises to attack, Columba makes the sign of the cross and commands it to go back, and it flees in terror.[1]
The story is set in the River Ness, not the loch, and it is one of many episodes in which Columba shows power over nature, a common motif in early saints’ lives. Skeptics such as the researcher Ronald Binns have argued that it says more about medieval hagiography than about an animal, and that other pre-1933 “sightings” are similarly doubtful.[1]
1933: the birth of a modern legend
In 1933 a new road, the A82, was completed along the north shore of the loch, clearing trees and giving drivers clear views of the water for the first time. On 2 May that year the Inverness Courier printed an article by Alex Campbell, a local water bailiff and part-time reporter, describing how Aldie Mackay, who ran a hotel at Drumnadrochit, had seen a whale-like creature rolling in the water. The paper’s editor is said to have suggested the word “monster.”[1]
In July 1933 a London couple, George and Mrs. Spicer, reported a large, long-necked creature crossing the road in front of their car, carrying what might have been an animal in its mouth, and disappearing toward the loch. Later researchers have pointed out that King Kong, with its long-necked dinosaur scenes, was showing in London that year. The story spread rapidly, and by the end of the year newspapers were sending reporters and hunters to the Highlands.[1]
Hippo feet and the surgeon’s photograph
In December 1933 the Daily Mail hired the big-game hunter Marmaduke Wetherell to find the monster. He soon announced that he had found its footprints on the shore. Scientists at the Natural History Museum in London examined the casts and found they had been made with a dried hippopotamus foot, probably the base of an umbrella stand or ashtray. Wetherell was publicly humiliated.[3]
A few months later came the most famous monster picture of all. The “surgeon’s photograph,” attributed to a respected London gynecologist, Colonel Robert Wilson, and said to have been taken on 19 April 1934, showed a small head and long neck rising from the water. For six decades it was the iconic image of Nessie. In 1994 Christian Spurling, Wetherell’s stepson, confessed shortly before his death that the photo was a hoax. Wetherell, wanting revenge on the Daily Mail, had asked him to make a model. The “monster” was a toy submarine fitted with a small head and neck sculpted from wood putty, and Wilson had been recruited to lend the picture his respectable name.[1][3]
Films, sonar and expeditions
- 1960, the Dinsdale film. Aeronautical engineer Tim Dinsdale filmed a hump moving across the loch. It was studied for years; later analyses suggested it showed a boat.[1]
- 1962–72, the Loch Ness Investigation Bureau. Volunteers kept watch from camera stations around the loch for a decade, gathering many reports but no definitive evidence.[1]
- 1972 and 1975, the Rines photographs. An underwater camera team led by Robert Rines produced images of an apparent diamond-shaped “flipper.” The published images were later found to have been heavily retouched.[1]
- 1987, Operation Deepscan. A line of boats swept the loch with sonar. A few contacts were made but none was conclusive, and fish, debris or seals have been suggested.[1]
- 2003, the BBC survey. A detailed sonar and satellite-tracking survey found no animal of substantial size.[1]
- 2023, “The Quest.” Hundreds of volunteers joined the Loch Ness Centre and the group Loch Ness Exploration for the biggest organized search in more than fifty years, using drones with infrared cameras and a hydrophone to listen for unusual calls. Nothing conclusive was found.[6]
The DNA survey
The most decisive modern study took a completely different approach. In June 2018 a team led by geneticist Neil Gemmell of the University of Otago in New Zealand collected 250 water samples from different depths and locations around the loch. Every living thing sheds traces of DNA into its surroundings, so the samples could reveal which species live in the loch without anyone needing to see them.[4]
The results, announced on 6 September 2019, found no trace of reptile DNA, and nothing from sharks, catfish or sturgeon, all of which have been proposed as monster candidates. “We can’t find any evidence of a creature that’s remotely related to” a plesiosaur, Gemmell said. What they did find was a striking amount of European eel DNA, at almost every sampling site. The DNA cannot reveal how big the eels are, but Gemmell concluded that “giant eels remain a plausible idea,” at least as an explanation for some sightings.[4]
Why not a plesiosaur?
The popular image of Nessie as a surviving plesiosaur, a long-necked marine reptile from the age of dinosaurs, runs into serious problems:[1][5]
- Time. Plesiosaurs disappear from the fossil record at the end of the Cretaceous, about 66 million years ago.
- The loch’s age. Loch Ness has existed only about 10,000 years. Any animal there must have arrived since the Ice Age.
- Breathing. Plesiosaurs breathed air. A population large enough to survive would have to surface constantly, in full view of the roads and cameras around the loch.
- Food and numbers. A breeding population of large animals would need a great deal of food. The loch’s fish stocks are modest, and one animal alone could not persist for decades.
- Anatomy. Studies of plesiosaur neck bones suggest they could not hold their necks up in the swan-like pose of the classic Nessie image.
What do people see?
The Loch Ness Centre counts more than 1,100 recorded sightings. Researchers who have studied them suggest that most have ordinary causes, and that there is probably “no single explanation of the monster,” as Ronald Binns put it:[1][6]
- Boat wakes that persist on the calm, narrow loch long after the boat has passed, looking like a line of humps.
- Waves and seiches. Wind and the loch’s shape produce standing waves and oscillations that can move against the wind.
- Animals, including large eels, swimming deer, otters, seals that occasionally enter from the sea, and diving birds.
- Floating logs and debris, sometimes buoyed by trapped gas so that they rise and sink.
- Optical effects such as mirages and refraction over still water.
- Hoaxes, from Wetherell’s hippo foot to fake “carcasses” and planted fossils.
Nessie today
Whatever lies in the loch, Nessie is real as an economic and cultural force. The monster draws visitors from around the world to Drumnadrochit, Fort Augustus and the Loch Ness Centre, and it has inspired films, books, cartoons and countless souvenirs. Many other lake monsters, including Champ of Lake Champlain and the Brosno Dragon of Russia, are introduced to the world as “the local Nessie.”
Our assessment
Loch Ness has been watched, filmed, sonar-swept and DNA-sampled more intensively than almost any other lake on Earth. The strongest pieces of “evidence” have been exposed as hoaxes or misreadings, and the DNA survey found no trace of the kind of animal the legend requires. What remains is a set of sincere sightings, mostly explained by waves, wakes, eels and other ordinary things, and a story that the world clearly loves.
References
- “Loch Ness Monster,” Wikipedia, citing Adomnán, Vita Columbae; the Inverness Courier (2 May 1933); R. Binns, The Loch Ness Mystery Solved (1983) and The Loch Ness Mystery Reloaded (2017); and later surveys.
- Adomnán of Iona, Life of St Columba, Book II, ch. 27, trans. Richard Sharpe (London: Penguin, 1995).
- “The Loch Ness Monster and the Surgeon’s Photo,” Museum of Hoaxes; see also D. Martin and A. Boyd, Nessie: The Surgeon’s Photograph Exposed (1999).
- “Otago scientist reveals Loch Ness Monster could be a giant eel,” University of Otago (6 September 2019).
- Darren Naish, Hunting Monsters: Cryptozoology and the Reality Behind the Myths (London: Arcturus, 2016).
- “Monster hunters are conducting the largest search of Loch Ness in more than 50 years,” NPR / Associated Press, via KAXE (21 August 2023).
Correction note (October 2026): This entry was rewritten from historical and scientific sources, replacing an earlier general description. The illustration above is an artistic impression.