Mysterious Caves Revealed

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Entertainment For decades geologists have known that Vietnam is home to some of the world's most spectacular caves. Now husband-and-wife explorers Howard and Deb Limbert of England have documented perhaps the world's largest cave. Watch "Mysterious Caves Revealed" and discover evidence that may support the theory of a hollow earth

For decades, geologists have known that Vietnam is home to some of the world's most spectacular caves. Now husband-and-wife explorers Howard and Deb Limbert of England have documented perhaps the world's largest cave. Watch "Mysterious Caves Revealed" and discover evidence that may support the theory of a hollow earth.

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