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Hi, walking over a vertical drop is scary. The biggest vertical drop I have been OVER (not next to but over) was 1.5 Km that's 4920 feet. A long, long way down, plum vertical under me. I was taking close up photographs of steel work on a South African Gold Mine. While they now mine down to 4 Km each shaft has to be less than this, so to get down that far you need to go down several shafts. Took some interesting images though. Scary to start with but you get used to it.

Mike