By Linda Tancs
In the shadow of the Ural Mountains in Russia’s Perm region you’ll find Orda Cave, the largest gypsum underwater cave in the world. The clarity of its waters afforded by the gypsum makes it a diver’s paradise, but, due to its maze-like quality and freezing temperatures, the inexperienced flippered spelunker need not apply. Ongoing discovery makes its total length a moving target, but 15,000 feet is a fair estimate.
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