What's the biggest man-made hole in the world?

Thursday 20th October 2011
Submitted by Kieron Allen

 

It depends how you measure it. The Chuquicamata opencast copper mine in Chile has the greatest volume of excavated earth (roughly 9 billion cubic metres) but it’s a ditch rather than a hole.

 

Bingham canyon, in Utah, is the deepest at 1.2km but it was a canyon to begin with so not all of it is man-made.

 

The Mir diamond mine in Siberia is the deepest ‘proper’ man-made hole. It’s 525m deep and 1,200m across. There’s a no-fly zone above it because the downdraft created by the hole had caused several helicopters to crash.

Without room to expand, would water still freeze?
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