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

Scientists say a 'fountain of gas' poured from jelly-like trembling earth in tundra on Belyy Island in northern Siberia.

Local reindeer herder witnessed the tundra explosion that led to birth of new hole in river.

Satellites show giant hole ringed by 20 'baby craters'.

Reindeer herders find more craters in the far north in a deepening puzzle for scientists. 

This is the first picture of mammoth bone marrow from which scientists are seeking to extract DNA to bring the extinct giant back to life.

Angelina Sadovnikova, then 11, came across the mummified Pleistocene rodent in a cavity left by woolly mammoth tusk diggers.

Toxic fuel from 21,000 ton leak reaches pristine lake, bypassing floating booms, as rivers of diesel pollution cover-up is exposed.

Scientists say there is growing evidence that rising temperatures were catalyst for massive unexplained holes in ground.