I tried out my regular drill on some rock and was surprised at how well it works. Seems about as fast as my hammer drill was.
Tried out the wedge/fether sets. Breaks rock easily. Both the drill and the wedge/feather test was on a rock that stuck up into the road going to the cave.
I moved the hose so that it was using a small 1,000 gallon cistern at the top of our property. This collects water from our Gazebo but is never used much. Then I ran about 1/3 of this water into the drain (about 2 hours). I hope that tomorrow when I put a camera in there it will be very obvious where the water goes from there.