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

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

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

Haunting beauty of massive hole as scientists examine frozen lake formed after giant blowout.

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

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

International researchers have gleaned these extraordinary hidden scientific secrets by drilling 318 metres into a unique lake in northeastern Siberia.

Western countries will send some of their most hardened criminals to serve sentences in special prisons in deepest Siberia.

New expedition in Laptev Sea suggests increase in the rate of underwater permafrost degradation.