The incredible pictures show the natural stalagmites and stalactites within some of the world's deepest caves, taken by keen caver Dave Bunnell, 61, from Delaware.
Mr Bunnell has captured breathtaking cave formations on camera in the Lechuguilla Cave, Carlsbad Caverns National Park, New Mexico - which is the deepest in the continental U.S. as well as the Rio Secreto cave in Costa Rica, and Tien Duoung cave, Vietnam.
Read more:dailymail.co.uk
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