★ 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.
★ The Mir diamond mine is so large that it sucks in helicopters with its downward air flow.
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