"Big sky and deep horizons break the cave routine for Todd Burks, who rappels 300 feet [91 meters] down to the forest floor after a dramatic mountainside survey. ... Burks hoped to investigate two virgin caves he had spotted on an expedition in 1995."
(Photographed on assignment for, but not published in, "Searching the Depths of Borneo's White Mountain," September 1998, National Geographic magazine)
Photograph by Stephen Alvarez
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