Construction workers discovered the mysterious lava-filled cave after spotting a small hole in on the surface of the hillside pouring out fumes last week.
Geologists are now flocking to study the unique sink hole on the outskirts of Urumqi, the capital of Xinjiang Uyghur Autonomous Region in north-western China.
The area was sealed off after the discovery of the phenomenon and scientists are now working to establish its origins.
Geologist Hu Tan who is leading the investigation into the 80 cm wide hole said:
"The air blasting out of the hole is so hot, that if you hold a branch near to it it bursts into flames.Although it is unusual, we're pretty certain that it has been caused by the spontaneous combustion of coal."Authorities are now moving in to seal off the opening over fears the toxic fumes could be harmful to locals
Culled from Uk Mirror
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