National Geographic: World Biggest Cave HD 720P Baidu Online Disk

Chinese name: National Geography : The largest cave in the world
English name: National Geographic: Worlds Biggest Cave

In 2009, a group of British cave experts explored the deep jungle in central Vietnam. They were surprised to find a very large cave and thought it was the largest cave in the world. This group of experts was the first human to enter this cave. They walked 6 kilometers underground until they were blocked by huge rock formations, which they called "the Great Wall of Vietnam". Now they come back with climbing equipment, together with geologists and zoologists, to study whether this is really the largest cave in the world, and what secrets are hidden in the cave.

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