Man ‘caused some of the tundra blasts forming the large holes’, says leading scientist in surprising new theory.

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

Same phenomenon of discharge of gas hydrates 'led to crater formation in Russia and disappearance of ships in Atlantic'.

Giant holes created when pingos erupted after filling with gas.

More craters expected to form due to such eruptions as permafrost melts - and they ARE caused by global warming releasing methane gas.

High levels of ‘fire ice’ trapped in permafrost may turn Russia into a global leader of new gas sources.

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

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

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.