15 Impressive Underwater Caves That Will Mesmerize You

15 Impressive Underwater Caves That Will Mesmerize You

Ordinskaya, Russia

Ordinskaya (also called Orda Cave) is the largest underwater gypsum cave in the world, and the only one that offers underwater excursions. It is believed to have been formed over 300 million years ago.

Interestingly, since gypsum is a water-soluble mineral, the cave’s structure keeps changing over time, with new passages and chambers formed on almost daily basis.

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