Turns out the house my wife and I just bought has a cave on it. I was alerted to the fact by a neighbor. Anyway, after finding it I decided to take a look. I gathered up some lights and such in my bag and tore out. I tied a rope to a tree at the entrance and climbed in. I figure I was about 300ft back when I saw that it was collapsed. It may be passable. I shined my light and it seemed like there was room over the top of all these small rocks. I'd like to get further but am no expert. Im sure moving these rocks could have dangerous results. I didnt have the time(told wife id be back in twenty minutes) or correct lighting(brightness) Does anyone have experience doing this?