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

Thursday 20th October 2011
Uploaded by: Kieron Allen
Asked by:

 

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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