Three man team probing the discovery is now 'missing in tundra', say Emergency Ministry officials.

NBC is banning Siberians from watching online trailers and a pilot of its new 'thriller' called 'Siberia'.

Bulging bumps in the Yamal and Gydan peninsulas believed to be caused by thawing permafrost releasing methane.

Massive Siberian source of diamonds formed by an asteroid 35 million years ago can 'overturn entire world gem market'.

This is the clearest evidence that our ancestors speared and killed the extinct giant.

Or is it a specially invented weapon to destroy Western food imports in retaliation for sanctions? 

Pipes are built over bulging and unstable Arctic pingos prone to violent eruptions caused by 'thawing methane gas', as seen twice on the Yamal peninsula this year.

A meteor? A rocket? A military missile? An UFO? So far no explanation for the lightshow over Trans-Baikal.

Flash seen over thousands of kilometres but scientists disagree over the cause.