“Ranger Doug Thompson captures life in an underground national park and humanizes one of the greatest careers a lover of the outdoors can have.”—Melody Webb, author of A Woman in the Great Outdoors: Adventures in the National Park Service
“In this book Doug Thompson takes us to underground places that even few cavers have explored and shows us their marvels—helicites, aragonite, draperies, columns. Best of all, in this compellingly personal book Thompson candidly shares his own fears and anxieties as he becomes initiated into the strange subsurface world.”—Robert Julyan, author of Hiking to History: A Guide to Off-Road New Mexico Historic Sites