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

Mysterious 'gigantic' hole in remote region spotted by helicopters over gas-rich Yamal peninsula.

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

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

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

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

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

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

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