Unbelievable Underwater River in Mexico ? The diver and photographer Anatoly Beloshchin captured in pictures amazing natural phenomenon – an underwater river. He found it a miracle on the bottom of the lake, located in the cave Cenote Angelita (east coast of the Yucatan Peninsula, Mexico). What do you think, what is the secret of the river? A phenomenon that has found Anatoly Beloshchin – it is a beautiful optical illusion. The fact is that in the fresh water lake gradually enters salt water. Therefore, at a depth of 30 meters is an interesting chemical reaction – hydrogen sulphide. Thus, the mist that spreads along the bottom and creates the illusion of water flow – is hydrogen sulfide.