crater

Three man team probing the discovery is now 'missing in tundra', say Emergency Ministry officials.

Subsidence from old coal mine a possible cause of latest mystery hole.

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.

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.