Haunting beauty of massive hole as scientists examine frozen lake formed after giant blowout.
Mysterious 'gigantic' hole in remote region spotted by helicopters over gas-rich Yamal peninsula.
Satellites show giant hole ringed by 20 'baby craters'.
Map of shame: Greenpeace highlights junk and debris in dozens of sites across the 'pristine' environment.
Warning of methane blasts in Kara Sea adjacent to Yamal craters caused by gas eruptions associated with melting permafrost due to global warming.
Local reindeer herder witnessed the tundra explosion that led to birth of new hole in river.
One region alone - Yakutia - has 5 million tons scrap metal dumped in polar regions, an ugly Soviet legacy.