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Forget mountain climbing or arctic exploration. Miles and miles underground, a more extreme adventuring is taking place — caving. 


On expeditions that can last months and require weeks below the surface of the earth, cavers are constantly trying to go deeper and deeper, braving strange diseases, risky scuba diving in underground lakes and other dangerous unknowns.
 

 follows an expedition of the world's most advanced cavers into Cheve  — possibly the deepest cave in the world, located in Mexico. Bilger describes the effort as "a kind of Everest expedition turned upside down."


And that underground world contains different kinds of risk:


Bilger joins The Daily Circuit to discuss the sport  and the cavers who practice it.

Madelyn Mahon

Author

They climb, hike and swim their way into the earth's depths.

Cavers explore upside-down Everests

Go Deeper.

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