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A deep passage of caves hidden hundreds of feet beneath the US reveal a hole new world. The spectacular network of lava tubes display a kaleidoscope of colour stretching 2.4 miles under Washington state. They were formed thousands of years ago as lava tube-forming flows stacked on top of each other inside a deep canyon. The youngest tube - the top level of the cave – is 8000 years old and is the opening to the 325ft system. Photographer Josh Hydeman, 33, explored with breath-taking formation with fellow adventurers Eric Guth, Garry Petrie and Jason George. (Photo by Josh Hydeman/Caters News/SIPA Press)
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