8Mir Mine – Mirny, Siberia

The Mir diamond mine in Mirny, Eastern Siberia, is one of the biggest man-made holes in the world. At 525m (1720ft) deep and 1200m (3900ft) wide.

It’s so huge it can suck in helicopters flying over it due to the downward air flow (the air space above is, therefore, off limits)…

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