This diamond mine in eastern Siberia (Mirny, to be exact) is so deep that the surrounding "air zone... is closed for helicopters" after "a few accidents when they were 'sucked in' by downward air flow..."
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This diamond mine in eastern Siberia (Mirny, to be exact) is so deep that the surrounding "air zone... is closed for helicopters" after "a few accidents when they were 'sucked in' by downward air flow..."
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