The mine owner and I will be joined by at least one other up top. Should have mentioned that there is electric power available to 90% of the mine and extension cords to the rest. Fans will be pushing air for the duration but I will be carrying backup lighting, gas monitors, and radio. There is a good sized compressor there so I might try a light impact hammer instead of sledge. I'm a safety nut so I'll have a full set of eye protection, ear protection, first aid, extra water/food, and anything else I can put on a check list.
Ever gone fishing and had to use a net for an oar?