In 2009, a team of British cavers investigated a recently uncovered cave in a remote Vietnamese jungle. The Son Doong cave is enormous;the explorers traveled for miles through the cave before hitting a 46-foot-high wall.
In 2009, a team of British cavers investigated a recently uncovered cave in a remote Vietnamese jungle. The Son Doong cave is enormous;the explorers traveled for miles through the cave before hitting a 46-foot-high wall.
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