Startling new details emerge of the most mysterious of Siberia's newly created giant permafrost holes.
Subsidence from old coal mine a possible cause of latest mystery hole.
Earth is moving as 'leaking methane gas due to global warming causes surface to bubble' in a new phenomenon.
Scientists rush to site of latest tundra eruption - which formed a crater 50 metres deep - amid fears for homes and key industrial sites.
Man ‘caused some of the tundra blasts forming the large holes’, says leading scientist in surprising new theory.
Local reindeer herder witnessed the tundra explosion that led to birth of new hole in river.
Bulging bumps in the Yamal and Gydan peninsulas believed to be caused by thawing permafrost releasing methane.
Scientists say there is growing evidence that rising temperatures were catalyst for massive unexplained holes in ground.
Satellites show giant hole ringed by 20 'baby craters'.
Gas bubbles from waters filling crater hole on Yamal peninsula two months after volcanic-style explosion in thawing permafrost.