I looked up the dive info. With my cavern certification, I’m limited to 70 ft. depth and 130 ft distance, within sight of the entrance. That’s about half way to the end of the shaft, which is 110 ft. depth and 180+ ft. distance. It’s pretty clear that the end of the cave is outside my training. What is your certification? If you are a cave diver, I can’t go as far as you can. There is also the choice of air / nitrox as well. Your thoughts?