This is a partially-flooded cave that was flooded by the creation of the Nickajack dam by the TVA in 1967. According to Wikipedia, "Today, Nickajack Cave is a Wildlife Refuge, operated by the Tennessee Wildlife Resources Agency. The cave is home to a bat colony that is estimated to number over 100,000 bats. The cave is a maternity roost where pregnant female gray bats come each spring to give birth and raise their young. There is an observation deck adjacent to the mouth, where visitors can watch the bats leave at dusk to go feed."
Posted by Greg Heil on March 23, 2012
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