What cave, located in Kentucky, has over 400 miles of passages?
Great Onyx Cave connected with the Flint Ridge Cave System, despite exploration efforts. In fact, passages in the Flint Ridge Cave System pass beneath surveyed passages in Great Onyx Cave. Rocks and sand were piled against the walls of the cave to make trails when the cave was commercialized, possibly blocking off passages which might connect to Mammoth Cave. Legend has it that this was the revenge of Turner, who was never able to profit from his discovery of Great Onyx Cave, against Edwards. Great Onyx Cave Great Onyx Cave is a cave located in Mammoth Cave National Park in Kentucky, United States.
Nickajack Cave a cave-in at the rear of the cave that blocked off what were rumored to be miles of additional passages. At least three endemic species were exterminated when the cave was inundated in 1967 – the crustacean "Caecidotea nickajackensis", the pseudoscorpion "Microcreagris nickajackensis" and the ground beetle "Pseudanophthalmus nickajackensis". 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.