The crater has an icy lake at its bottom with water cascading down its eroding permafrost walls. Picture: Andrey Naumenko, 'Yamal-Region'
They found the crater - around up to 70 metres deep - has an icy lake at its bottom, and water is cascading down its eroding permafrost walls.
It is not as wide as aerial estimates which suggested between 50 and 100 metres.
While the team insist that it is a 'natural phenomenon', they insist further study is essential to understanding the formation of the crater in lake-studded Yamal - a name which means 'end of the world' in the local tongue.
Andrey Plekhanov, Senior Researcher at the State Scientific Centre of Arctic Research, said: 'The crater has more of an oval than a circular shape, it makes it harder to calculate the exact diameter. As of now our estimates is about thirty metres.
'If we try to measure diameter together with soil emission, the so-called parapet, then the diameter is up to sixty meters.
'The crater is from 50 to 70 metres deep'.
More pics and text: http://siberiantimes.com/science/casestu...the-world/