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Drone flies inside giant Yamal permafrost crater for first time, dipping 15 metres below the surface 25 February 2021 Underground aerial survey throws important new light on these eerie giant holes, enabling a first 3D model. 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. In summer 2020, researchers from ....