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Gateway to the underworld: The enormous permafrost 'megaslump' in Siberia that keeps getting bigger

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The Batagay crater is the largest megaslump in the world, measuring 3,250 feet ( 990 meters ) wide.

The gateway exposed layers of permafrost that had been frozen for up to 650,000 years .

The crater is expanding annually by about 35 million cubic feet ( 1 million cubic meters ) Researchers found an intact, 42,000-year-old Pleistocene horse in the crater's headwall.