At the back of the generator cave (last post) there is another tunnel carved out of solid rock that goes two hundred yards out to the base of the waterfall cliff. No pipe or anything, just water on cave floor. ( you can see the water rushing under the planks. ) There is this gangway you get to walk on to get to the exit. It started with about 5 feet of head room. I'm 6'5" so I had to crab walk for the first hundred yards or so. Then it opens up a bit. The view of the river from the exit was awesome. I'll be posting that soon I hope.