Another couple of photos from the Cenote of Multún-Ha, near Cobá, Yucatán. Those rocks on the lower left of the photo are actually under about three meters of water. That's how clear the water is, and how still it was until Kris jumped in and started swimming around.
This photo is from about the same location, but looking straight up to the natural hole 15 meters above our head. Those are tree roots reaching down through the space almost to the water below.