129' Pit in Thunderhole 📷 Warren Wyatt
129' Pit in Thunderhole 📷 Warren Wyatt

Thunderhole Nature Preserve


Putnam County, Tennessee
5,622 feet

In 2020, the NSS signed a Memo of Understanding to re-open a classic TAG pit to experienced cavers. The 129-foot pit is formed at the Hartselle-Monteagle contact and during rainfall, a waterfall occurs the full length of the wall opposite of the entrance and disappears into the floor. Thunderhole has been dye-traced to caves in Hidden Hollows Springs. The amazing generosity of the landowner allows cavers to enjoy access and helps the NSS with our mission of education, exploration, and conservation of caves.

Want to Visit?

Access to the cave is available via permit. Please refer to the access rules below prior to applying for a permit.

On January 9, 2020, the NSS Board of Governors unanimously approved a Joint Management Agreement and NSS Preserve Management Plan for Thunderhole Cave. The Preserve Management Team has organized push trips into the cave and plans to clean trash out of the cave using volunteers.