NASA’s 2022 satellite image showed discolored water associated with volcanic activity at Kavachi; it did not show sharks. Scientists filmed sharks during a separate 2015 expedition, when a rare lull allowed them to explore the crater. The observation does not show that the sharks were inside an eruption or adapted to survive one.
The “Sharkcano” story combines two separate events
Kavachi is an active submarine volcano in the Solomon Islands. NASA’s Landsat 9 satellite acquired an image of discolored water near the volcano on May 14, 2022. The shark footage came from a scientific expedition in January 2015, seven years earlier.
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Researchers observed silky and hammerhead sharks inside the crater during a rare lull in activity. The study documents an unusual encounter and raises ecological questions; it does not establish that the sharks were present during an eruption, permanently lived in the crater, or had special adaptations.
In short, NASA captured a satellite image of a discolored surface plume. An expedition team, using underwater and other field instruments, observed the sharks in 2015.
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What is the Sharkcano?
“Sharkcano” is the nickname associated with Kavachi after researchers reported sharks inside its submerged crater. Kavachi lies about 24 kilometers south of Vangunu Island, and NASA describes its summit as roughly 20 meters below sea level.
The nickname does not mean NASA photographed sharks or that the animals were swimming in lava. The observation was made during a lull, not during a documented eruption.
What NASA captured in 2022
Landsat 9’s Operational Land Imager-2 acquired the image on May 14, 2022, showing discolored water at the surface near Kavachi. NASA published it on May 17. Its report says Kavachi had entered an eruptive phase in October 2021 and discolored water was seen in April and May 2022.
The image is satellite imagery of surface water, not underwater footage. NASA describes Kavachi’s plumes as potentially containing material such as volcanic rock fragments, sulfur, and particles. A plume image does not show the sharks or establish the conditions in the water around them.
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- It does not show individual sharks or the inside of the crater.
- It does not establish whether sharks were present when the image was acquired.
- It does not show the sharks swimming during an eruption.
NASA’s image documents a discolored plume. The shark observations came from the separate 2015 expedition.
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When researchers filmed sharks at Kavachi
In January 2015, researchers visited Kavachi during a rare lull in activity. The expedition explored inside the crater and along its flanks, using underwater and other field instruments. The team had observed inactivity for several days from a safe perimeter before approaching.
The expedition reported sharks identified in NASA’s summaries as silky and hammerhead sharks, along with other marine life. The primary study, published in Oceanography, presents these as observations from that expedition—not evidence that the sharks were there during an eruption.
Were the sharks inside an active volcano?
They were observed inside Kavachi’s submerged crater, which belongs to an active submarine volcano. But the expedition took place during a lull, not while the researchers documented an eruption.
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The study does not establish that the sharks permanently lived inside the crater, remained in the most extreme conditions, or could survive an eruptive episode. Its findings raise questions about the ecology of active submarine volcanoes and the extreme environments in which large marine animals can exist.
What is known about the conditions?
The expedition collected physical and chemical measurements, including temperature, gas flux, and plume observations. NASA describes Kavachi’s plumes as potentially involving superheated, acidic water, particles, volcanic rock fragments, and sulfur. Those descriptions do not provide a measurement of the water surrounding each shark during filming.
Do not treat plume descriptions as proof that the sharks endured an eruption or continuously occupied the hottest or most acidic water. The expedition report documents observations made during a lull; it does not establish the sharks’ exposure over time.
Are the Kavachi sharks mutant?
The cited research does not report mutant sharks, a new species, or special inherited adaptations to volcanic conditions. It reports observations of silky and hammerhead sharks in the crater.
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Calling the animals “mutant,” “volcano-proof,” or adapted to survive lava goes beyond the evidence. The study presents the encounter as a reason for further ecological questions, not as proof of a special evolutionary trait.
What the observation can tell us
The 2015 expedition documented marine life in and around Kavachi during a rare lull. NASA’s 2022 and 2024 reports document later satellite observations of discolored plumes. Together, these accounts describe a remarkable site, but they do not link the sharks to any particular later plume or establish how the animals use the volcano over time.
Kavachi’s documented observations
| Date | What was reported | Source |
|---|---|---|
| October 2021 | Start of the eruptive phase described in NASA’s 2022 report. | NASA Earth Observatory, citing the Smithsonian Global Volcanism Program |
| January 2015 | Expedition observed sharks during a rare lull in activity. | Phillips et al., Oceanography |
| May 14, 2022 | Landsat 9 acquired an image of discolored water near Kavachi. | NASA Earth Observatory |
| March 8, 2024 | Landsat 8 acquired an image of a plume near Kavachi. | NASA Earth Observatory |
These are dated observations, not a statement about Kavachi’s current status. See NASA’s reports on the 2022 image and the 2024 plume, and the 2016 expedition paper.
What is observed and what remains unproven?
| Evidence | What it supports |
|---|---|
| Observed | Landsat 9 captured discolored surface water near Kavachi on May 14, 2022. |
| Observed | A 2015 expedition observed silky and hammerhead sharks in the crater during a rare lull. |
| Not established | That the sharks were present during an eruption or any later satellite observation. |
| Not established | That the sharks permanently live in the crater or have special adaptations to volcanic conditions. |
Why the story is often misunderstood
The viral version combines a 2022 satellite image with a separate 2015 biological observation. NASA did not film or discover the sharks. The expedition team observed them; NASA later used satellites to capture discolored water near the volcano.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is Kavachi safe to visit or dive?
The expedition’s access depended on a rare lull. Researchers observed inactivity for several days from a safe perimeter before approaching. That account is not evidence that the volcano is safe for visitors or divers; the study describes an exceptional research encounter, not a recreational opportunity.
Frequently Asked Questions
Did NASA film sharks in an underwater volcano?
No. NASA’s 2022 image shows discolored surface water near Kavachi. Scientists observed sharks during a separate 2015 expedition.
Were the sharks inside an erupting volcano?
Researchers observed them inside the crater during a rare lull in activity. The expedition does not show that they were there during an eruption.
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Where is the Sharkcano?
Kavachi is a submarine volcano in the Solomon Islands, about 24 kilometers south of Vangunu Island, according to NASA.
Are the sharks mutant or adapted to lava?
The cited study does not report mutations or special adaptations. It documents sharks in the crater and raises questions about marine life in extreme environments.
What did NASA actually capture?
Landsat 9 captured a discolored surface plume near Kavachi on May 14, 2022. It did not photograph sharks or show the inside of the crater.
The bottom line
The Sharkcano story joins two different observations: researchers filmed sharks in Kavachi’s crater during a 2015 lull, and NASA captured discolored surface water near the volcano in 2022. The research does not show sharks inside an eruption, permanent residence, or special adaptations.
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