The cone is curiously shaped with a crater at the top and a small mound in the center.
The mound is about 40 meters high and 100 meters across at the base.
The smaller mound at the top is about 12 meters high.
Since the discovery of the crater, there have been many theories as to what could have created it.
For a long time it was believed to be a meteorite impact structure.
Some linked it to the Tunguska meteorite, whose remains have never been discovered.
But the crater does not resemble any other known meteorite site.
This has given rise to wild theories of hidden nuclear plant and buried UFO with nuclear fuel on board.
So far no object like the fragments of an asteroid or any metal under the crater has been discovered.
More recent work on the crater has thrown up another more likely explanation a gas volcano.
The mound could have formed by the underground release of some fluids such as hydrogen.
