National Geographic News

Sótano de las Golondrinas, Mexico

Photograph by Stephen Alvarez

A spelunker begins his 1,234-foot (376-meter) descent into Sótano de las Golondrinas in San Luis Potosí, Mexico. The cave's entrance is the second deepest in the world, making the lengthy ascent out dangerous and difficult for even the most seasoned cavers.

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