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

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

Startling new details emerge of the most mysterious of Siberia's newly created giant permafrost holes.

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

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

Warning of methane blasts in Kara Sea adjacent to Yamal craters caused by gas eruptions associated with melting permafrost due to global warming.

Gas bubbles from waters filling crater hole on Yamal peninsula two months after volcanic-style explosion in thawing permafrost.

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.

Concern from scientists over potential danger to gas production facilities in region vital for energy supplies.