Hikers Confirm What We All Suspected - Underground Tunnels

Three friends went hiking in Yosemite's backcountry, hoping to make memories before life got too busy. But they found something they were never supposed to see - a massive stone doorway built into a hillside leading deep underground, unexplainable time loss, and a terrifying scream that seemed barely human. So when they tried to document their discovery, Park staff appeared to ensure their evidence disappeared forever. But, how many others have found these doorways to underground tunnels?