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6. Mirny Diamond Mine-Siberia 俄羅斯西伯利亞米爾鉆石礦坑
The Mirny Diamond Mine is 525m deep and has a diameter of 1200m. It was the first, and one of the largest, diamond Pipes in the USSR. It is now abandoned. While it was still operational, it would take two hours for trucks to drive from the top to the bottom of the mine.
米爾鉆石礦坑深525米，其直徑為1200米，它是前蘇聯最早、最大的管狀鉆石礦之一，目前這處礦場已被廢棄。據稱，在該礦場處于開采運行時，一輛卡車從礦坑底部開到頂部需要兩個小時的時間。
