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.
Scary storm too close for comfort!
All day Peter and the students had been watching the weather systems developing. There was a trough moving down from Broome which...