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.

There are lakes, clouds, and even vegetation and wildlife in the cave!

There are beaches with the finest sand in the world, little lakes with water like emerald, and a river that runs through the whole cave.