Thanks for the advice. As a former mining engineer I very well understand role of safety and professional knowledge.
Impressive.In my caving days I once did a 150ft rappel with full SCUBA gear to start a cave dive at the bottom. The weight of the tank flipped me upside down. No problem. I rappelled the 150 ft inverted. Didn't get right side up until I got to the bottom. To get out, I had my topside helpers haul the tank up by itself, with a tag line to keep the tank from banging against the walls of the pit. I didn't want to try to rope walk up with the tank pulling me upside down!