Methane explosion? Meteorite crater? Scientists baffled by gigantic 262ft hole that has appeared at Siberia's 'End of The World'
Anna Kurchatova from the Sub-Arctic Scientific Research Centre, thinks the crater was formed by a mixture of water, salt and gas igniting an underground explosion, a result of global warming.
Gas accumulated in ice could have mixed with sand beneath the surface, and then mixed with salt.
Some 10,000 years ago this area was a sea.
Global warming may have caused an 'alarming' melt in the under-soil ice, released gas and causing an effect like the popping of a Champagne bottle cork, Ms Kurchatova suggests.
Yamal, a large peninsula jutting into Arctic waters, is Russia's main production area for gas supplied to Europe.
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