Two highly experienced rebreather divers approach the Grim Reaper sign at Ginnie Springs inside Devil's Ear Spring. These signs are meant to warn untrained divers about the hazards of diving in underwater caves.
Two divers explore the tunnels inside Peacock One at Peacock Springs State Park near Luraville, Florida. Photographer Jill Heinerth captures their departure in to the watery labyrinths.
The view from inside the planet as a cave diver peers through the clear water at Little Devil Spring in Ginnie Springs, High Springs, Florida.
Debra and Larry Green pass pass through the vaulted tunnels of the Gallery at Devil's Ear Spring, Ginnie Springs, Florida.
Peering out from inside the Main Spring at Ginnie Springs, High Springs, Florida, photographer Jill Heinerth has captured the vision that only cave divers see from inside the planet.
Jill Heinerth captures the Gallery Tunnel at Devil's Ear Spring, Ginnie Springs, Florida - illuminated by a single cave diver's light.
Peering out from inside planet earth, a cave diver views the world above with a new set of eyes. Devil's Eye Spring, Ginnie Springs, Florida.
Peacock Springs - A diver descends into the water labyrinth of Peacock One at Peacock Springs State Park near Luraville, Florida. Photo by Jill Heinerth.
A diver ascends after diving in the clear waters of Troy Springs State Park near Branford, Florida.
A quiet evening descends over Hart Springs Park in Gilchrist County near Trenton, Florida. This stunning image took photographer Jill Heinerth the course of an evening to capture the magical light in the turquoise spring water.
George Rice enters the cavern zone at Madison Blue Springs State Park in North Florida.
Two divers approach the Lips at Ginnie Springs inside Devil's Ear Spring.
Two divers ascend from the emerald depths of Troy Spring on the edge of the Suwannee River in Branford, Florida.
Little River Spring on a quiet evening. Branford, Florida.
Wes Skiles Peacock Springs State Park cave diver
A diver swims through the passages at Peacock One at Peacock Springs State Park near Luraville, Florida.
Scott Blair descends into Blue Grotto using his Megalodon Closed Circuit rebreather.
Exploring the cavern in Blue Grotto, near Williston, Florida.
George Rice explores the beauty of Madison Blue Springs State Park by traveling through the depths of its cave system.
A diver floats effortlessly in the clear water of the cave at Peacock One at Peacock Springs State Park near Luraville Florida.
Larry and Debra Green demonstrate the proper use of a cave diving reel while maintaining excellent buoyancy control that contributes to protecting the cave environment.
Diver Jerry Murphy exploring a little known cave in the Ichetucknee Springshed in North Florida.
The magical wonder of the Main Spring at Ichetucknee Springs State Park near Fort White, Florida.
A diver explores the stunning tunnels of Peacock Springs State Park, Florida.
A rebreather diver pauses momentarily before entering the cave at Devil's Ear Spring, Ginnie Springs, Florida.
The tannic water of the Santa Fe River mixes with turquoise spring water at Devil's Ear at Ginnie Spring, High Springs, Florida.
John DeRoo and Jo Cribley enter Devil\'s Eye Spring at Ginnie Springs, near High Springs, Florida.
A diver floats in other-wordly colors where the tannic water of the Santa Fe River mixes with turquoise spring water in Devil\'s Ear Spring, near High Springs, Florida.
A cave diver swims through the Catacombs of Ginnie Springs.
A diver floats in Peacock Springs underwater cave passages.
The steps at Little devil Spring lead to the water where cave divers embark on journeys into the planet.
Two side mount cave divers explore the depths of Black Lagoon at Hart Springs in Gilchrist County, Florida.
Two divers swim through the tunnels at Madison Blue Spring State Park in Florida.
Jameos del Agua cave in Lanzarote is known as the tunnel to Atlantis.
Lava tubes inside te Monte Corona volcano on Lanzarote, Canary Islands.
Tom Iliffe looks for small stygobitic animals inside the lava tube caves of Lanzarote's Jameos del Agua, the tunnel to Atlantis.
Tom Iliffe looks for small stygobitic animals inside the lava tube caves of Lanzarote's Jameos del Agua, known as the tunnel to Atlantis.