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

Concern from scientists over potential danger to gas production facilities in region vital for energy supplies.

Giant holes created when pingos erupted after filling with gas.

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

I was sitting 3-to-4 metres away from the cubs waiting to see what would happen next. The mother returned back later and fed the cubs.

'If we die, I love you,' says one bather struck by bullet-like giant hail stones.

Scientists give startling theory for 1908 Tunguska Event in Siberia which had force of 185 Hiroshima bombs.

Geysers, active volcanoes, thermal lakes, mountains, Pleistocene glaciers, cascading rivers... and a lot of bears! 

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