世界上最大的坑洞是位于米尔尼，东西伯利亚，俄罗斯。冬季气温在米尔尼，一个市镇仅低于北极圈内，平均为摄氏-40 度。
该城始建于1955年，地质学家来到tiolpxe地区的大量矿产财富。因此，米尔尼的决定性特征是一个1 1 / 2公里宽， 500米深的洞，现在这是钻石矿。
该地区有世界上最大的金刚石矿，俄罗斯84．1％的金刚石资源集中在这里，原生矿的矿石中金刚石含量为每吨0．4克，金刚石矿发现於1949年，70年代开始大量开採，几乎有半个城市大，现已关闭。
译文:
The Biggest Hole in Milney, Russia
The biggest hole is in Milney, east Siberia, Russia. The average temperature in winter in Milney, a county which is only lower than the Arctic Circle, is about -40 Degree Centigrate.
The county was built in 1955. The geologists came to Tiolpxe area because of the abundance reserve of mineral. So, it fetures as hole of 11/2 miles wide and 500 metres deep, which now is a diamond mine.
There is the biggest adamas mine here in the world and 84.1% of the adamas resources are right here. There are 0.4g/ton in the primary ore. It was firstly found in 1949 and has been extracted widely since 1970's, which is almost as large as half of a city and now it has already been closed.