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    The "Door to Hell" Darvaza underground is naturally rich in natural gas. In 1971, during a drilling, geologists accidentally found an underground cavern filled with natural gas. The ground on which the drilling rig was placed collapsed, leaving a large gaping hole exposed with a... more

    Reviewed by griguthul Sep 04 2008, 02:13pm ( 181 reviews ) slightlywarped.com

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