Cancun Underwater Museum
Adventures Destinations Diving Interesting

10 Stunning Underwater Wonders

10. See the Orda Cave at Ural Mountains, Russia . Diving in Orda Cave. The Orda Cave is a system of crystal gypsum caves stretching under the Ural Mountains in Russia. It is one of the longest series of caves on earth. The water surrounding the caves offers crystal clear clarity because of the mineral surroundings.