Going underground at Wind Cave National Park

Producer Marc Sanchez finds out what it’s like to explore one of the biggest networks of caves in the world — and new branches are still being discovered. Marc will show us the wonders hidden underground at this national park in South Dakota and how tricky it can be to go to uncharted territory with only a headlamp to light the way.

The natural opening at Wind Cave. (Marc Sanchez | Brains On)

The natural opening at Wind Cave. (Marc Sanchez | Brains On)

A chamber of Wind Cave called The Fairgrounds. (Marc Sanchez | Brains On)

A chamber of Wind Cave called The Fairgrounds. (Marc Sanchez | Brains On)

You can't eat this popcorn, but you can find it on the walls of Wind Cave. (Marc Sanchez | Brains On)

You can’t eat this popcorn, but you can find it on the walls of Wind Cave. (Marc Sanchez | Brains On)

Marc Ohms and Ranger Earl of Wind Cave National Park. (Marc Sanchez | Brains On)

Marc Ohms and Ranger Earl of Wind Cave National Park. (Marc Sanchez | Brains On)