A British caver wades through Vietnam's Son Doong cave, Earth's largest known cave passage, according to a survey team.
At 262-by-262 feet (80-by-80 meters) in most places, the Son Doong cave beats out the previous world-record holder, Deer Cave in the Malaysian section of the island of Born
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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