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Dec 21, 2015 06:00 PM ET // Patrick J. Kiger
Some undiscovered ones may extend far deeper into the Earth than the record of 1.36 miles.
Aug 10, 2015 12:30 PM ET // Patrick J. Kiger
Some of the oddest sites on our planet are below the surface.
Mar 16, 2015 05:00 PM ET // Paul Heltzel
See amazing footage from a drone fly-through of the Hang Son Doong cave in Vietnam, the largest in the world.
Dec 4, 2013 11:45 AM ET // Denise Chow, LiveScience
The microorganisms can survive underground despite the extreme dearth of light and nutrients.
Oct 11, 2012 01:47 PM ET // Tim Wall
A newly discovered species of reef coral hangs from the ceiling of undersea caves like a colony of petrified bats.
Nov 30, 2012 09:58 AM ET // Christina Reed
Scientists have found a stalagmite in an Oregon cave that tells the story of thousands of winters in the Pacific Northwest.
Jan 2, 2013 08:12 AM ET // Tim Wall
In the gloom of the caves and gorges of China, a plant has been discovered thriving in the dark.
Sep 23, 2010 12:00 AM ET // Michael Reilly
A daring, death-defying race to find the planet's deepest hole is chronicled in a gripping new book.
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