Imagine walking in a field in Florida 100 years ago and falling into a hole about 25 feet wide and then plunging downward about 50-75 feet to land in a 72 degree, fresh water pool. The only light comes from the opening above you and the cool water appears to be an underwater maze of large boulders. Well, that's how I picture Devil's Den over 100 years ago. Since then, a nice diving park has been built around the "hole" and lights have been installed in the underground pool as well as a set of wooden stairs that vanish into the earth and lead you to the water's edge. Pretty darn cool if you ask me. Add some large catfish and you have a Devil's Den. I read that the name comes from the fog that would gather at the top of the hole making the sink look like a "Devil's Den" to the locals. Fun place to dive. If you visit northern Florida, dive here and then drive down the road and spend some time at Ginnie Springs as well. Nice topside facilities too!