dylanforsberg: The Mirny Diamond Mine in Russia is the world’s biggest hole - it’s 525 meters deep and 1.25km wide.The suction above the hole resulted in several helicopter crashes, so all flight above the hole is now prohibited. (via)

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dylanforsberg: The Mirny Diamond Mine in Russia is the world’s biggest hole - it’s 525 meters deep and 1.25km wide.The suction above the hole resulted in several helicopter crashes, so all flight above the hole is now prohibited. (via)

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