The Warren Miller Film Tour Rides Again with ‘Winter Starts Now’
What to Know Before You Buy Your Next Sleeping Bag
Paracyclist Clara Brown Is Redefining What It Means to Be an Elite Athlete
An Inside Look of Hillary Gerardi Taking On the Du Mont-Blanc 90K
Want to Camp Comfortably This Winter? Get a Canvas Tent.
A Mesmerizing Drone Film of Water and Land Intertwined
How to Keep Your Gadgets Charged Outdoors
Blake Hansen’s Transgender Journey via Mountain Biking
Bet You Didn’t Know a Kayak Could Do This
This Man Is Fighting Climate Change by Managing 100,000 Acres of Forest
The Case for ATVs
This One Is for All the Boat Lovers
Meet Máxima, an Indigenous Peruvian Farmer Fighting to Save Her Land
Kuat’s New Bike Rack Is Cleverly Designed and Easy to Use
Bikepacking for Beginners: A Lesson in Wonder
Wes Siler’s Extremely Dialed Elk Bowhunting Gear
Kayaking Underground in Mexico
Get access to everything we publish when you sign up for Outside+.
The Rio Chontalcoatlán runs underground for nearly six kilometers, carving an intricate tunnel system in the heart of the Grutas de Cacahuamilpa National Park near Guerrero, Mexico. With high-lumen headlamps as their only guides, paddlers Jared Meehan, Andrew Pollock, and Rafa Ortiz navigated a three-kilometer stretch of the Chontalcoatlán. This video of their run from River Roots makes us think that rushing into the dark rapids of subterranean rivers may be the greatest thrill-factor.