National Geographic Assignment

A male spelunker observes an underground pool of water in an illuminated cave. By Stephen Alvarez, an adventure photographer, specializing in caving.

caving: A male spelunker observes an underground pool of water in an illuminated cave. By Stephen Alvarez, an adventure photographer, specializing in caving.

All images and information © 2013 National Geographic Assignment • Unauthorized reproduction or use of images is prohibited

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