Abandoned Mir Diamond Mine in Russia. Mir Mine also called Mirny Mine is a former open pit diamond mine located in Mirny, Eastern Siberia, Russia. At the time of its closing in 2004, the mine was 525 meters deep and 1,200 meters across making it the second largest excavated hole in the world, after Bingham Canyon Mine. The hole is so big that airspace above the mine is closed for helicopters because of incidents in which they were sucked in by the downward air flow.

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