Many years ago I was helping place the DCA P bolts in various caves and mines, and the hand picked shaft in Hillocks needed rebolting. No one else was around to help so I went on a solo trip through the oil drum entrance. Bit of a struggle as had the drill, batteries, resin, bolts, hole washing and cleaning kit as well as personal SRT kit and ropes. In due course crawled up the coffin level to the shaft and "spread out" all the kit in the crawl. Drilled and cleaned the holes and placed the bolts. Originally had planned to descend further and do some more on the lower pitches through the stopes, but as I sat on the lip of the pitch I had a feeling of unease and being unwelcome, being out on a limb and intruding where I shouldnt be. As a resullt once the resin was in and the bolts placed I packed up and left with perhaps undue haste. I put my feelings down to being on a solo trip, resin fumes in a confined space causing localised bad air, and psyching myself out. Being alone in a system is an awful lot different to being there with others, even if only in distant/intermittent contact! After exertion and resting, your breathing sounds really loud, and it is even possible to hear your own heartbeat depending on acoustics with your lamp off in the velvety black with just the odd drip or settling stone from where you have disturbed rubble in your passing.