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Worlds Largest Cave Discovered In Vietnam - More info : http://vietnamcave.net

A British caver wades through Vietnam's Son Doong cave, Earth's largest known cave passage, according to a survey team.

Photograph by Barcroft/Fam...

The biggest known cave in the world is hidden in a jungle in Vietnam, but a team of cavers with the help of a local farmer are exploring its depths...

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