Another Look at the Mind-Boggling Underwater River Located Inside a Water-Filled Cave
10/12/2014
Another Look at the Mind-Boggling Underwater River Located Inside a Water-Filled Cave
At first glance, the image above appears to show a diver in a lake of some sort, but in reality, it's an underground river called Cenote Angelita in Mexico's Yucatan Peninsula. They are common geological forms in low latitude regions, particularly on islands, coastlines, and platforms with young post-Paleozoic limestones that have little soil development. The Yucatan Peninsula contains a vast coastal aquifer system, which is typically density-stratified. Continue reading for more pictures and information.
http://www.techeblog.com/index.php/tech-gadget/another-look-at-the-mind-boggling-underwater-river-located-inside-a-water-filled-cave
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Wow! 
Thanks for the post!
Maybe that secret cavern with the crazy dragon. 
... but then I took a shark to the knee!
OK, so that's totally made up, but I couldn't pass up the opportunity.
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Hydrogen sulfide is common in deep, still water (the whole bottom of the Black Sea is full of the stuff) and is highly toxic. It can be absorbed through the skin, so divers have to minimize the time they are in contact with it.
