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This is the result of Russian well drilling operations in Turkmenistan in 1970! Shortly after initially drilling into what they thought was a large oil deposit, the ground collapsed leaving a 70 odd meter crater, and releasing huge amounts of natural gas. Rather than letting huge plumes of toxic gas leak into the atmosphere, they decided to set it alight, thinking it would burn out within a few days. I guess they were wrong, because it’s still burning today!