You can’t tell what lies beyond a cave’s entrance by looking at it. And that is one of caving’s great allures—exploring what cannot be easily seen. https://on.natgeo.com/2PzWHx7

You can’t tell what lies beyond a cave’s entrance by looking at it. And that is one of caving’s great allures—exploring what cannot be easily seen. https://on.natgeo.com/2PzWHx7 

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