Drone flies inside giant Yamal permafrost crater for first time, dipping 15 metres below the surface. First-ever 3D model of the newest permafrost heaving mound that exploded in summer 2020 on the Yamal peninsula. Picture: Vasily Bogoyavlensky
Some 20 large craters have formed in recent years after explosions of bulging mounds in areas of the Russian Arctic. The cause is believed to be a build up of methane gas triggering blowouts which send ice and frost soil hundreds of metres from the epicentre.
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