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World's Longest Underwater Gypsum Cave Orda Cave - World's Longest Underwater Gypsum Cave in Russia World's Longest Underwater Gypsum Cave Russia's  Longest Underwater Cave World's Longest Underwater Gypsum Cave underwater gypsum  crystal  cave  in the  world World's Longest Underwater Gypsum Cave World's  Greatest  Gypsum Cave  In Russia World's Longest Underwater Gypsum Cave its  water is so clear divers can see over 50 yards ahead of them. World's Longest Underwater Gypsum Cave  its volumes in its galleries can be stretch up to five kilometers. World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum Cave this cave is world greatest cave located in a village of Russia  World's Longest Underwater Gypsum Cave World's Longest Underwater Gypsum...