A British caver wades through Vietnam’s Son Doong cave, Earth's largest known cave passage,according to a survey team.
A local farmer,who had found the entrance to the Son Doong cave several years ago, led the joint British-Vietnamese expedition team to the cavern in April. The team found an underground river running through the First 1.6 miles(2.5 kilometers)of the limestone cavern,as well as giant stalagmites more than 230 feet(70 meters) high.
A massive cave recently uncovered in a remote Vietnamese jungle is the largest single cave passage yet found, a new survey shows.
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