The Darvaza gas crater known locally as the "Door to Hell" or ''Gates of Hell", is a natural gas field collapsed into an underground cavern located in Derweze, Turkmenistan.
Geologists set it on fire to prevent the spread of methane gas, and it is thought to have been burning continuously since 1971. The diameter of the crater is 69 metres (226 ft), and its depth is 30 metres (98 ft).
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Geologists set it on fire to prevent the spread of methane gas, and it is thought to have been burning continuously since 1971. The diameter of the crater is 69 metres (226 ft), and its depth is 30 metres (98 ft).
Source