Cadborosaurus

For more than a century, people along the Pacific Northwest coast have reported encounters with something large, serpentine, and unexplained moving beneath the water. Scientists remain skeptical. Locals remain convinced: there is something in the waters.

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The waters off the Pacific Northwest have always carried stories.

Stories of fog thick enough to swallow entire coastlines. Of storms that appear without warning. Of things glimpsed briefly between waves before vanishing beneath the surface. For generations, Indigenous communities, fishermen, sailors, tourists, and coastal residents have described encounters with something unusual moving through the cold waters stretching from British Columbia to Alaska.

The creature has become known as Cadborosaurus, or simply "Caddy" ,a cryptid often described as a long-bodied marine animal with a horse-like head, undulating through the ocean like a serpent. To skeptics, it is little more than folklore amplified by imagination and poor visibility at sea, but to others, it may be an unknown marine species hiding in one of the least explored environments on Earth.

The Bay Where the Legend Began

The modern legend of Cadborosaurus takes its name from Cadboro Bay near Victoria, where numerous sightings were reported during the late 19th and early 20th centuries.

Newspapers from the era occasionally published strange accounts from fishermen and coastal residents describing long, eel-like creatures moving offshore. Reports varied in detail, but certain characteristics appeared repeatedly: A serpentine body with multiple humps visible above the water, and an unusually large head resembling that of a horse or camel. Witnesses often emphasized the speed of the creature. Some described it weaving through the water in vertical coils, while others compared its motion to that of a giant snake.

Unlike classic sea serpent legends from Europe, Cadborosaurus was rarely portrayed as overtly monstrous or aggressive. Instead, many sightings describe a creature behaving like a marine animal simply moving through its environment, surfacing briefly before disappearing beneath the waves.

A Coastline Built for Mystery

The Pacific Northwest is an ideal environment for marine legends. The coastline is immense, fragmented by islands, fjords, dense forests, and deep inlets. Visibility is often poor due to fog, rain, and rough water conditions. Large marine animals frequently surface unexpectedly, sometimes appearing distorted by waves or distance. And beneath the surface lies an environment still surprisingly unexplored.

Despite advances in marine biology, scientists estimate that large portions of Earth's oceans remain poorly understood. New deep-sea species are discovered every year, including creatures previously thought impossible or extinct. That uncertainty creates fertile ground for stories like Cadborosaurus, because while many sightings can likely be explained by whales, giant oarfish, sea lions, or misidentified debris, not all reports fit neatly into those categories.

The Serpent in the Sea

Long before the name "Cadborosaurus" existed, Indigenous peoples of the Pacific coast carried stories about powerful serpent-like beings inhabiting the sea.

Various First Nations oral traditions describe large marine creatures associated with danger, storms, or the spiritual world beneath the water. These stories vary significantly between communities and should not be treated as identical to the modern Cadborosaurus legend. However, they reflect a long-standing cultural awareness of the ocean as a place filled with unseen life and unexplained forces.

In many coastal traditions, the boundary between the natural and supernatural has never been entirely rigid. Animals, spirits, environmental forces, and mythology often overlap in ways that are difficult to separate through modern Western categories.

Some researchers argue that recurring sea serpent stories across cultures may reflect repeated encounters with unusual marine phenomena later interpreted through mythology. Others believe such legends reveal something deeply human: our tendency to project mystery onto environments we still cannot fully understand or control. Either way, the Pacific Ocean has inspired fear and fascination long before modern cryptozoology gave those feelings a name.

Possible Explanations

Over the decades, a number of known animals have been suggested as explanations for Cadborosaurus sightings.

• Sea Lions

In 1943, two police officers — Inspector Robert Owens and Staff Sergeant Jack Russell — reported seeing what they initially believed was a massive sea serpent with a horse-like head in the Georgia Strait.

Using binoculars, they later realized the "serpent" was actually a large bull sea lion leading several others through the water. Their bodies surfaced rhythmically in sequence, creating the illusion of one long creature. To the naked eye, the sight convincingly resembled a sea monster.

• Giant Oarfish

Some researchers have suggested that Cadborosaurus sightings may involve the giant oarfish (Regalecus glesne), sometimes called the "king of herrings."

These deep-sea fish can grow up to 17 meters (56 feet) long and move through the water in a serpentine motion. Their long silver bodies and unusual swimming patterns make them one of the more plausible explanations for certain sightings.

• Basking Sharks

Decomposing basking sharks have also contributed to sea serpent legends around the world. As they decay, parts of the jaw and gill structure detach first, often leaving behind a body shape that resembles a long-necked prehistoric reptile or plesiosaur.

Several supposed "sea monster carcasses" later turned out to be partially decomposed basking sharks.

Modern Sightings

Despite skepticism, sightings have continued into modern times. More than 300 reports have been documented over the past two centuries, particularly around coastal areas such as Deep Cove, Saanich Inlet, Island View Beach, and even as far south as San Francisco Bay.

One of the most discussed modern incidents occurred in 2009, when fisherman Kelly Nash reportedly filmed several long-bodied creatures moving through the waters of Nushagak Bay in Alaska.

According to Nash, the footage showed between ten and fifteen creatures, including smaller ones that appeared juvenile. A brief segment later appeared on the Discovery Channel program Hilstranded, where the hosts unsuccessfully attempted to locate the creatures themselves. The footage remains controversial and inconclusive, but for believers, it added another layer to the mystery.

The Most Famous "Evidence"

The most controversial moment in the Cadborosaurus story occurred in 1937. A strange carcass was reportedly discovered inside the stomach of a sperm whale caught near Naden Harbour.

Photographs taken before the remains disappeared appeared to show a long-necked, serpentine animal unlike anything immediately recognizable. Some cryptozoologists argued it could represent physical evidence of Cadborosaurus itself. Skeptics strongly disagreed.

Marine biologists later suggested the remains were likely those of a decomposed whale, shark, or other known marine animal distorted during digestion and decomposition. Without the original specimen, definitive analysis became impossible. The photographs remain heavily debated to this day.

Science, Skepticism, and the Unknown

Mainstream science does not recognize Cadborosaurus as a real species. Most marine biologists argue that sightings can be explained through a combination of environmental conditions, misidentification, expectation, and folklore reinforcement. The ocean is visually deceptive, particularly in poor weather or low light.

There is also the question of biology. For a large marine species to remain undiscovered for centuries, it would likely require a breeding population substantial enough to leave behind clearer physical evidence — bodies, bones, DNA, or reliable footage.

So far, none has emerged. And yet, uncertainty remains difficult to eliminate entirely. Because a lack of evidence is not always the same thing as proof of impossibility. The ocean conceals more than almost any environment on Earth. Giant squid were once dismissed as myth before eventually being confirmed as real animals. Rare deep-sea species continue to surprise researchers even today.

Even now, despite satellites, sonar mapping, and advanced exploration technology, humanity has explored only a fraction of the world beneath the waves. Vast underwater regions remain dark, inaccessible, and largely unknown. And somewhere beyond the fog banks and cold Pacific currents, something moving beneath the surface still might be possible.