A Copernicus Sentinel-2 satellite image captured this month shows the Batagaika crater, the world's largest permafrost slump, in eastern Siberia [1].
The image highlights the scale of ground collapse in the Sakha Republic, where rising Arctic temperatures are triggering the thaw of ancient frozen soil. This process creates massive depressions that threaten to destabilize the landscape, and release trapped carbon.
Known locally as the "Door to the Underworld" or "Gateway to Hell," the feature is technically classified as a megaslump [1, 3]. It formed as permafrost melted, causing the earth to collapse into a widening void [2, 3]. The crater has been expanding at a rate of several meters per year [2].
"The Batagay megaslump is a dramatic example of permafrost thaw that is accelerating across the Arctic," Dr. Alexey Vasiliev said [2].
Scientists monitor the site because the thawing process exposes soil that has been frozen for millennia. This exposure allows organic matter to decompose, which can lead to the emission of greenhouse gases into the atmosphere.
"Scientists warn that the rapid expansion of the Batagaika crater could release large amounts of greenhouse gases trapped in the frozen soil," Prof. Elena Petrova said [3].
The Sentinel-2 imagery provides a clear view of the crater's progression from orbit, allowing researchers to track the slump's growth more accurately than ground-based observations alone [1]. This data helps map the vulnerability of other permafrost regions across the Russian north.
“The Batagay megaslump is a dramatic example of permafrost thaw that is accelerating across the Arctic.”
The expansion of the Batagaika crater serves as a physical indicator of the feedback loop between Arctic warming and atmospheric carbon. As the 'mega-slump' grows, it not only alters the geography of the Sakha Republic but potentially accelerates global warming by releasing methane and carbon dioxide that were previously sequestered in the permafrost.
