A labyrinth that could be the world's deepest cave.

Stunning photos by nature.

Is This the Underground Everest?
http://www.nationalgeographic.com/magazine/2017/03/dark-star-deepest-cave-climbing-uzbekistan/?utm_source=Twitter&utm_medium=Social&utm_content=link_twp20170302magazinedarkstarutm_campaign=Content&sf59515971=1