Son Doong, The World’s Largest Cave.

 

The Son Doong Cave in Vietnam is the biggest cave in the world. It’s over 5.5 miles long, has a jungle and river, and could fit a 40-story skyscraper within its walls.  But nobody knew any of that until about six years ago.  The recently discovered cave has been touted as the largest in the world, although other caves vie for the title of longest (Mammoth Cave in Brownsville, Kentucky nabs that title with about 400 miles of passageways) and deepest (Krubera Cave in the nation of Georgia).  A local man discovered the cave entrance in 1991, but British cavers were the first to explore it in 2009. Tour company Oxalis has been running trial tours of the cave since two summers ago.  The lucky people who have entered Son Doong so far, like photographer John Spies, have emerged with some amazing photos.


 

VIETNAM - FEBRUARY 16: The Hand of Dog stalagmite in Hang Son Doong Cave. (Photo by Carsten Peter/National Geographic/Getty Images)

Fields of algae from ancient pools blanket parts of the cave’s interior.

VIETNAM - MAY 02: Hang Son Doong explorers navigate an algae-covered cavescape. Phong Nha Ke Bang National Park, Vietnam. (Photo by Carsten Peter/National Geographic/Getty Images)Son Doong is a jackpot of rare cave pearls. The pearls form over hundreds of years as water drips down, dries up and leaves layers of calcite crystals on grains of sand.

Scientists have discovered never-before-seen plant species around Son Doong’s waterfalls. Oh, and there’s a whole river in there, too.

VIETNAM - MAY 02: Cascading water in Hang Son Doong. Phong Nha Ke Bang National Park, Vietnam. (Photo by Carsten Peter/National Geographic/Getty Images)

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