Gagak yata Gagak dakala tiyanavada?

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Dec 20, 2009
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Its really hard to believe a river under Water. Here a description of the Diver : "We are 30 meters deep, fresh water, then 60 meters deep – salty water and under me I see a river, island and fallen leaves… Actually, the river, which you can see, is a layer of hydrogen sulphide."

Place : Cave Cenote Angelita, Mexico.
Diver: Anatoly Beloshchin.

mcn H2S is a highlly poisonus gas, can it be frozened under water?