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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Scientists reported an active gas-hydrate cold seep called the Freya Hydrate Mounds on Molloy Ridge in the Greenland Sea, at a depth of 3,640 metres. The site releases methane and crude oil and supports chemosynthetic animal communities in a place where sunlight cannot reach. The finding extends the reported depth limit for Arctic gas-hydrate outcrops by nearly 1,800 metres, but it does not overturn everything scientists know about deep-sea life.
What scientists discovered
The Freya Hydrate Mounds are a gas-hydrate cold seep: a seafloor site where gases and fluids escape. A 2025 EurekAlert! release describes methane seepage, crude-oil emissions and chemosynthetic communities at 3,640 metres on Molloy Ridge in the Greenland Sea. The release says the site extends the known depth limit for Arctic gas-hydrate outcrops by nearly 1,800 metres. Those figures are reported by the release, rather than independent measurements presented here. EurekAlert! release
According to Earth.com’s 2025 account of the detailed report, observations covered roughly 100 by 100 metres and included three conical mounds, two collapse pits, exposed hydrate and animals such as tubeworms, other worms, snails and amphipods. Earth.com report
How a cold seep differs from a hydrothermal vent
Both cold seeps and hydrothermal vents release material from the seafloor, but they are not the same habitat. A cold seep emits gases or fluids; a hydrothermal vent releases heated, mineral-rich fluids. The Freya site is described as a cold seep, not a hydrothermal vent. Researchers report unexpected biological connections between this seep and Arctic hydrothermal-vent communities, making the relationship between these habitats a subject for further study. EurekAlert! release Earth.com report
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How animals live without sunlight
At this depth, sunlight does not power the food web. Instead, chemosynthetic microbes use chemical energy associated with seep fluids, including methane, to make organic matter. Animals can benefit from these microbial partnerships or feed within the community they support. The reported fauna at Freya shows that animal life occupies this dark, chemically distinctive habitat; the available reporting does not establish the exact feeding relationship for every animal observed.
What “rewrites the playbook” means—and what it does not
The phrase comes from expedition chief scientist Giuliana Panieri, who said: “This discovery rewrites the playbook for Arctic deep-sea ecosystems and carbon cycling,” as quoted in secondary reporting. Source quoting Panieri In concrete terms, the discovery adds a documented seep at an unusually great reported depth and evidence of associated fauna and biological connections with vent communities. It does not mean a single site has overturned all understanding of deep-sea ecosystems.
University of Southampton researcher Jon Copley said there are likely to be more very deep gas-hydrate seeps awaiting discovery in the region, and that their marine life may contribute importantly to deep-Arctic biodiversity. That is a view about the possibility and significance of other sites, not a count of undiscovered seeps or proof of their ecological effects. Source quoting Copley
What the discovery says about methane and climate
The reported methane seepage makes the site relevant to questions about carbon cycling, but the reporting cited here does not quantify how much methane reaches the atmosphere or demonstrate a climate effect caused by Freya. A methane release at the seabed should not be treated as an atmospheric-emissions measurement. The finding supports studying the seep and its ecosystem; it does not supply a site-specific climate estimate.
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Key reported figures
| Figure | What it describes | Source and qualification |
|---|---|---|
| 3,640 metres | Reported depth of the Freya Hydrate Mounds | EurekAlert! research release, 2025; reported figure, not independently remeasured here. Source |
| Nearly 1,800 metres | Reported extension to the known depth limit for Arctic gas-hydrate outcrops | EurekAlert! research release, 2025. Source |
| About 100 by 100 metres | Area associated with observations of mounds and collapse pits | Earth.com account, 2025. Source |
Why the finding matters
The discovery documents an animal-bearing, chemosynthetic seep habitat in a part of the Arctic seafloor where life depends on chemical energy rather than sunlight. Its reported biological connections with hydrothermal-vent communities also raise questions about how distinct deep-sea habitats relate to one another. Those are reasons to investigate the site and search for comparable environments—not evidence that its climate impact or wider ecological role has already been measured.
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