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    So you want to swim somewhere a little more interesting? The world's largest underwater gypsum cave. Orda Cave, Russia

    spelunking

    orda cave, russia

    Exploring Orda Cave, the biggest underwater gypsum cave in the world - Russia

    The Orda Cave Awareness Project charted and explored the largest underwater gypsum cave system in Russia

    Largest cave in the world.

    spelunking

    Crystal Cave - Mexico. Gypsum crystals

    The largest swimming pool in the world!

    Spelunking

    Fingal’s Cave - Inner Hebrides, Scotland - [404 x 640] - Imgur

    caving

    Underwater cave exploration.

    caves

    caves

    Caves.

    Caves

    caves

    Largest zip line in the world! Costa Rica

    Ice Cave

    The largest cypress forest in the world at Caddo Lake, Texas/Louisiana...ALSO only natural (not man made) lake in Texas!