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A remotely operated vehicle recovered a fossilized megalodon tooth from a Pacific seamount about 3,090 meters—roughly 10,000 feet—below the ocean surface. The tooth was ancient; the surprising part was its documented deep-sea setting.
A remotely operated vehicle recovered a fossilized megalodon tooth from a Pacific seamount about 3,090 meters—roughly 10,000 feet—below the ocean surface. The discovery was made during a 2022 expedition near Johnston Atoll, and the specimen was identified only after scientists examined the collected material in a laboratory.
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The find is remarkable because researchers documented the tooth on the deep seafloor before sampling it. It is not evidence that living megalodons survive in the modern ocean. The tooth is millions of years old; what was unexpected was the deep-sea setting in which it was found.
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The discovery occurred during expedition NA141 aboard the Ocean Exploration Trust’s research vessel E/V Nautilus in 2022. The expedition explored waters near Johnston Atoll, a remote Pacific location within the Johnston Unit of the Pacific Remote Islands Marine National Monument.
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The target was a previously unsurveyed seamount approximately 150 miles, or 240 kilometers, south of Johnston Atoll. Instead of sending divers or a crewed submarine to the seafloor, scientists used Hercules, the expedition’s remotely operated vehicle (ROV). The vehicle collected geological samples from the seamount at a depth of about 3,090 meters.
At first, the sample did not necessarily look like a shark tooth. It was coated in a gold- or amber-colored layer of ferromanganese material, a mineral-rich deposit commonly associated with very slow chemical and geological processes on the deep seafloor. The object was recognized as a megalodon tooth after the material was examined at the University of Rhode Island’s Marine Geological Samples Laboratory.
What the fossil looked like
The tooth measured approximately 2.7 inches, or 6.8 centimeters, in length. Its cutting edges still showed visible serrations—the small saw-like points characteristic of megatooth sharks.
The unusual color does not mean the tooth was recently shed, preserved in a fresh state, or somehow protected from fossilization. Its appearance is associated with ferromanganese coating and chemical alteration in the deep marine environment. The specimen is a fossilized tooth from an extinct animal.
The word “massive” needs some qualification. Megalodon itself was massive, with research-based estimates placing its maximum body length above 15 meters. But the available reports do not establish that this individual 6.8-centimeter tooth was a record-size megalodon tooth. In this headline, “massive” is better understood as a description of the enormous shark that once owned it—not a verified ranking for the specimen.
Why finding it in situ matters
Fossil shark teeth have been recovered from deep-sea environments before. The important distinction here is that the tooth was observed on the seafloor and then sampled from that documented location. Scientists describe this as an in-situ observation and sampling.
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“In situ” does not mean the tooth was still attached to a shark, lying beside a complete carcass, or guaranteed to be precisely where the animal lost it. A tooth can move after entering the ocean. Instead, the term means researchers recorded the specimen in its surrounding seafloor setting before removing it.
The tooth’s relatively intact serrations provided useful context. If a fossil tooth had been transported a long distance by currents, waves, or sediment movement, its edges might show more abrasion or damage. The preserved serrations were interpreted as evidence that the tooth had not undergone extensive transport and wear.
That makes the discovery different from finding an old tooth in an anonymous dredged sediment sample. The surrounding geological setting gives researchers more information about how the fossil reached the deep ocean and how it was preserved there.
Who—or what—was megalodon?
Megalodon is the common name for the extinct megatooth shark formally treated in the discovery research as Otodus (Megaselachus) megalodon. It lived millions of years ago and occupied marine ecosystems in which large prey, including marine mammals, were available.
Scientists reconstruct megalodon from fossil teeth and other fragmentary remains because shark skeletons were made largely of cartilage, which fossilizes less readily than bone. Teeth were continually shed and replaced, making them the most familiar and abundant evidence of the species.
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Does this mean megalodon is still alive?
No. The deep location of the tooth is not evidence of a surviving megalodon population.
The specimen is fossilized, and the scientific evidence places megalodon’s extinction millions of years in the past. Its discovery at great depth reflects the history of the seafloor and the ability of marine geological environments to preserve fossil material. It does not show that the shark still inhabits the deep Pacific.
The confusion is understandable: the fossil was found in a modern deep-ocean setting, and many people associate the deep sea with unexplored animals. But “found deep underwater” and “alive in the deep ocean” are entirely different claims. This was an ancient tooth preserved in a geological environment—not a fresh tooth from a hidden shark.
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The expedition found more than one ancient clue
The megalodon tooth was one of several notable observations from the Johnston Unit expeditions. Ocean Exploration Trust reported mapping more than 55,275 square kilometers of seafloor, including broad areas inside the marine monument. ROV dives examined seamounts and guyots—flat-topped underwater mountains—as well as deep-sea habitats and geological features.
The expedition also documented fossilized whale bones and deep-sea biological records. Together, these observations show why seamounts matter to ocean science: they can preserve geological evidence, support distinctive communities, and reveal parts of the seafloor that have rarely been observed directly.
Why a fossil tooth can end up on a deep seafloor
A megalodon tooth would originally have entered the ocean in a coastal or open-water environment where the shark lived. Over millions of years, several processes could separate that fossil from its original setting. Sediment can move, ocean basins can change, and the seafloor can be buried, exposed, or altered by geological activity.
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Seamounts add another layer of complexity. These underwater mountains rise from the ocean floor and can interact with currents, sediments, and exposed rock. A fossil found on a seamount may have been preserved or concentrated there through a long sequence of geological events. The exact path of this tooth cannot be reduced to the idea that a shark simply sank straight down to 10,000 feet.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How this discovery should—and should not—be described
- Accurate: A fossilized megalodon tooth was recovered from a Pacific seamount at approximately 3,090 meters.
- Accurate: Researchers reported an in-situ observation and sampling of a fossil megalodon tooth from a deep-sea Pacific locality.
- Too broad: This was the first megalodon tooth ever found in the deep ocean. Earlier deep-sea fossil shark teeth had been recovered.
- Incorrect: Scientists found a living megalodon tooth or proof that the species still survives.
- Unsupported: This was one of the largest megalodon teeth ever discovered.
For readers interested in collecting, a megalodon tooth replica can provide a safer and more accessible educational display than purchasing an unspecified fossil. Authentic fossil teeth and replicas are different products, and a retail specimen should never be presented as the tooth recovered by the Nautilus expedition. Buyers should check the seller’s identification, measurements, provenance, condition, and whether the item is explicitly described as authentic or reproduced.
What the tooth tells us about the ocean
The discovery’s biggest lesson is not that a prehistoric predator is hiding beneath the waves. It is that direct observation of the deep seafloor remains limited. A robotic vehicle exploring a little-studied seamount found an important fossil in a sample that initially looked geological, and laboratory examination revealed its significance later.
That sequence—from mapping, to ROV observation, to careful sampling, to laboratory identification—is typical of why deep-ocean exploration matters. The seafloor can preserve biological and geological records that are invisible from the surface. Even a single tooth can connect modern oceanography with marine ecosystems that disappeared millions of years ago.
The 2022 find is therefore best understood as a paleontology and ocean-exploration discovery: an ancient megalodon tooth, documented in its deep Pacific setting, preserved beneath a mineral coating, and recovered by a robot from a seamount about 10,000 feet below the surface.
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Frequently Asked Questions
Does the deep-sea tooth prove that megalodon is still alive?
No. The recovered object was a fossilized tooth, and scientific research places megalodon’s extinction around 3.5 to 3.6 million years ago. Its deep-sea location reflects geological preservation, not a surviving shark population.
What does “in situ” mean in this discovery?
The tooth was observed on the seafloor before it was collected. It does not mean the tooth was still attached to a shark or remained exactly where it was lost; it means scientists documented its geological setting in place.
How big was the megalodon tooth?
It was approximately 2.7 inches, or 6.8 centimeters, long. That is a substantial fossil tooth, but available research does not establish it as one of the largest megalodon teeth ever found.
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The tooth was collected by Hercules, a remotely operated vehicle aboard the Ocean Exploration Trust’s research vessel E/V Nautilus. It was not recovered by a crewed submarine.
The Bottom Line
The specimen was a fossilized megalodon tooth recovered in 2022 from a Pacific seamount at approximately 3,090 meters. Its importance lies in the documented in-situ deep-sea setting—not in any evidence that living megalodons remain in the ocean.
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