Irkutsk photographer captures multi-layered columns of bubbles through crystal clear ice.
New expedition in Laptev Sea suggests increase in the rate of underwater permafrost degradation.
Subsea permafrost thaws faster than previously thought, Russian scientists say.
Vital for making its waters so 'pure', one theory is that rising underwater methane leaks are killing off the sponge, but is there a silver lining?
Scientists rush to site of latest tundra eruption - which formed a crater 50 metres deep - amid fears for homes and key industrial sites.
Satellites show giant hole ringed by 20 'baby craters'.
Startling new evidence of thawing of glacial ice in less than six decades, with process speeding in last ten years.