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| Known Caves of Tennessee, USA |
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There are more than 14,000 known caves in Tennessee. It is in the area of south Eastern United States that cavers refer to as TAG and Tennessee has the most, with 9,200 known caverns. Over millions of years, the slow dissolution of the region's limestone belt riddled the bedrock with tunnels and chambers, creating a subterranean world in which the potential for exploration is almost limitless. The Rumble Room (pictured), a limestone cavern in Rumbling Falls, Tennessee, measures some 350ft floor to ceiling and spans four acres.
 People have been exploring the region's caves since prehistoric times, but the system is so vast that unknown conduits and million-year-old piping are still being discovered. Here, a caver wriggles into an unexplored cavern in Tennessee.
 Cavers use rock climbing equipment to lower themselves into the depths, but even with headlamps on, high beams barely illuminate some chambers. Here, a spelunker enters a shaft of Tennessee's Indianapolis Cave.
 Spelunking is not for those with claustrophobic tendencies. Cavers sometimes squeeze through extremely tight spaces to discover new routes, driven by the itch to see what no one else has seen before. Cavers solve three-dimensional puzzles in motion, getting themselves through barely body-sized spaces while simultaneously figuring out how to move critical gear such as ropes, lights, food and water along with them as they go.
 TAG's caves contain a plethora of ancient treasures, including rock formations that have formed over hundreds of millions of years, prehistoric animal remains and some of the oldest human footprints in North America. Native American pictographs and petroglyphs (pictured) were found inside Devilstep Cave, which is part of Cumberland Trail State Park in eastern Tennessee.
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