PHOTOS: Gigantic River Cave Revealed in Laos

PHOTOS: Gigantic River Cave Revealed in Laos
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Cave explorers nicknamed this large room "the Cathedral" for its high, vaulted ceiling.

Explorer John Pollack calls the Xe Bang Fai River cave "an underground K2," which, based on the volume of water that passes through the cave and the size of its passages, is likely one of the largest river caves on Earth.

Expedition co-leader Bob Osburn is producing a highly detailed map of the cavern, and Pollack expects an article on the team's work and map to appear in the journal of the National Speleological Society in 2009.

He hopes to return to the cave in 2010.
—Photograph by Dave Bunnell
 
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