Sergey Zimov, a scientist, digs up mammoth and bison bones at Duvanny Yar, a permafrost ‘megaslump’ or a thermokarst depression. The area is an important scientific destination for scientists studying permafrost thaw, as well as the history of late Pleistocene era Beringia land, with thousands of years of historical and climate information located in the layers of crumbling soil