It's time to start digging out the sinkhole in Farmer Al's field. Al brings out a big tractor so that we can move the limestone rocks from around the entrance to what we hope will be a huge cave system in the sinkhole. After moving a bunch of rocks I slip underground to attempt to break into the unexplored underground tunnel. The rock walls were very close and the drop was almost verticle. We did drop a camera down deep into the hole, but the video footage was shaky at best. I ran a few minutes