The “gateway to the underworld,” a huge crater in Siberia’s permafrost, is growing by 35 million cubic feet (1 million cubic meters) every year as the frozen ground melts, according to a new study.
The crater, officially known as the Batagay (also spelled Batagaika) crater or megaslump, features a rounded cliff face that was first spotted on satellite images in 1991 after a section of hillside collapsed in the Yana Uplands of northern Yakutia in Russia. This collapse exposed layers of permafrost within the remaining portion of the hillside that have been frozen for up to 650,000 years — the oldest permafrost in Siberia and second oldest in the world.
New research suggests that the Batagay megaslump’s cliff face, or headwall, is retreating at a rate of 40 feet (12 meters) per year due to permafrost thaw. The collapsed section of the hillside, which fell to 180 feet (55 m) below the headwall, is also melting rapidly and sinking as a result.
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