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.
Cor - check this out. This is something that occurs reasonably regularly but isn't often seen. In this case there's a surface shear caused by friction of the wind against the grou...
...my trike during the repair of my fork carrier due to a recent Service Bulletin from the manufacturer. Dismantling began 4th February. Delays caused by lack of gas for powder coa...
...oyed. In one caravan park, the residents had fortunately chosen last night to go out for tea together, or there would have been many more injuries caused by falling trees, shattered c...