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Ordinskaya Cave, Moscow, Russia - "Ordinskaya Cave the longest underwater cave in Russia, the second longest underwater cave in Eurasia and the longest in the world cave in gypsum" - Courtesy of 'Ordinskaya Cave' Facebook Group

Ordinskaya Cave, Moscow, Russia - "Ordinskaya Cave the longest underwater cave in Russia, the second longest underwater cave in Eurasia and the longest in the world cave in gypsum" - Courtesy of 'Ordinskaya Cave' Facebook Group

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