In Vietnam’s Phon Nha-Ke Bang National Park in 1991, a simple farmer discovered an unexplored cave.
The man was terrified and did not dare to investigate it since a terrifying roar of water greeted him at the entrance.
It appears that a team of British experts just made the decision to travel deep inside in 2009. What did they discover?
A fantastic, self-contained world of 5 kilometers long and 150 meters wide.
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