Reindeer herders find more craters in the far north in a deepening puzzle for scientists.
The stunning pictures of a volcanic eruption and lava flow were taken by Liudmila and Andrew, bloggers and travellers.
Mysterious 'gigantic' hole in remote region spotted by helicopters over gas-rich Yamal peninsula.
Running water is one of the most soothing and relaxing sounds known to man, but here it signals the rapid thawing of ground frozen for thousands of years.
Locals hear 'booms from the underworld' in giant ravine but now scientists say it holds secrets of the planet's past.
Russian scientists deny theory of respected Italian team by 'proving' that the remote blue lake is older than the famous 1908.
Scientists give startling theory for 1908 Tunguska Event in Siberia which had force of 185 Hiroshima bombs.
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.
Latest survivors give harrowing accounts of how they feared they would drown in underground tidal wave.