Popular Science



The Gouffre Berger system in France descends to a nadir that sits 3,500 feet below sea level, about the height of three and a half Eiffel Towers. To get there, cavers spend at least 15 minutes paddling through a freezing, 10-foot-deep river. As Shone’s fellow explorer illustrate­s here, a waterproof camera bag can serve as a flotation device. In heavier rains, the porous limestone in the well-documented system allows the eroding water to surge to the roof, continuing to slowly carve the rock in the process.

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