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In 2014 a mysterious crater-hole was discovered in the Yamal peninsular, northwest Siberia, Russia. It was 'probably caused by methane released as permafrost thawed' according to researchers, and the result of 'internal forces not seen in 8,000 years'. Since then new information has come to light, with witnesses reporting an 'explosion' and a 'glow in the sky' from 100 km away.See also:
This would indicate an extremely powerful explosion occurred from below to form this 'crater-hole', in a region known in the local Nenets language as the 'end of the world'. The recent discovery by scientists of methane 'bubbles' on the remote Belyy Island in the Kara Sea off the Yamal Peninsula coastline may be another alarming sign of increased activity in the depths.
Comment: See also: BOOM! Mysterious blasts rattling the skies are on the increase around the world - UPDATE at least 64 documented events (VIDEO) and Michigan Meteor Event: Fireball Numbers Increased Again in 2017