Underwater river in Mexico, a hoax?

A friend of mine once whined about feeling utterly useless when she was heavy with a child, alone in her parents-in-law's house, zapping channels and ended up watching a local gossip show. She pointed out that you'd know your life is pathetic when you have nothing better to do than watching such shows in the middle of a work day. But today, I had the opportunity of enjoying all my morning at home watching TV and felt totally fine with it! I got to work later than usual because my oh-so-nice boss offered to pick me up and he had something to do in the morning :-).

I think I was watching Insert, and they were talking about something particularly interesting today - gossip show style, but this was not another jibber jabber of some celebrity's life. It was about a so-called phenomenon in Mexico, in which they said to be the nature's mystery. One celebrity, Olga, was telling about his acquaintance who sent him a YouTube video of a discovery of a river under the sea somewhere in Mexico. It was shown that divers found some plants and trees 100 feet under the sea, and a stream of what they said fresh-water under sea water. Unnaturally, the so-called river doesn't mix with the sea water, forming an illusion of a river. To make things more convincing, the divers kinda opened their masks and tasted the water. Fresh water, they claimed! The presenters, and all the celebrities interviewed were referring this phenomenon as an amazing discovery and relate it to something either supernatural or non-human, just like some kind of the fabled Area 51.

Curious, I did cyberslacking later at the office and browsed the info about this alienated underwater river and learnt that it's actually an underwater cavern situated at Cenote Angelita in Mexico. The illusion of river turns out to be a dense cloud of hydrogen sulfate trapped in between sea water, and it doesn't dissolve because of the different density, and there's nothing supernatural or non-human about it. In some blogs it's written as a popular diving site, but some people would just refer it as a photographic hoax, pointing out that it would be impossible to get such clarity in such depth. Hmm, diving is really not my cup of tea, but hoax or not, the pictures showing this eerie site are just fabulous!