Alone, you notice the quiet right away. All sound, man-made and nature-made falls away within 10 feet of the narrow cave entrance. Eyes acclimate within a minute or so to the dim, directed light of your headlamp. Surrounding darkness accentuates the dust that is slowly flowing through your light beam. There is dirt on the floor but what is the source of the suspended fine dust drifting around your face?
The cave is breathing. You can’t hear it but air comes in and out of holes in the exposed limestone with the changing day and night temperatures and air pressure. How cool is that? Caves breathe!