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Son Doong Cave – Biggest cave in the world

Sơn Đoòng cave “Mountain River cave” in Vietnamese, is a cave in Phong Nha-Kẻ Bàng National Park in Vietnam. It has a large fast-flowing underground river inside. It is the largest cave in the world. Credit: sondoongcave.org.

Explore the worlds largest known cave in this documentary. A world on its own, all within a cave, with a unique ecosystem, a large fast-flowing underground river and uncharted parts.

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