The Mir diamond mine is so large that it sucks in helicopters with its downward air flow.
Also known as the Mirny mine, this mine in Siberia is the second-largest diamond mine in the world. It’s 1,722 feet deep and 3,900 feet wide. The giant hole had to be cut into thick permafrost, and it required the use of jet engines and explosives to dig into it. At its peak of production, the Mir mine produced over 10 million carats of diamonds every year. After a few accidents involving the mine sucking in helicopters, the airspace above is now off-limits.
(source)
Also known as the Mirny mine, this mine in Siberia is the second-largest diamond mine in the world. It’s 1,722 feet deep and 3,900 feet wide. The giant hole had to be cut into thick permafrost, and it required the use of jet engines and explosives to dig into it. At its peak of production, the Mir mine produced over 10 million carats of diamonds every year. After a few accidents involving the mine sucking in helicopters, the airspace above is now off-limits.
(source)
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