A scuba-divers delight, and a natural phenomena

In Cenote Angelita - Mexico there is a cave in which you can find under water rivers.

What makes these rivers so interesting is that at 30meters depth the water is fresh water, but at 60 meters the water becomes salt water.

At 60 meters you will see hydrogen sulfide layer that looks like a river giving you the feel of a "river flowing inside a river", especially once you start combining this river of H2S with trees and foliage.

Hydrogen sulfide, is a coulourless gas, toxic, flammable and smells like rotten eggs. These gases can arise from biological activity when bacteria break down organic material in a state without oxygen (anaerobic activity), Such as in the swamp, the sea and sewage. Gas was also featured on the gas arising from volcanic activity as natural gas.

Enough science talk! Check out these photo's