Inside China’s mysterious sinkhole – BBC REEL

Deep in China’s Fengjie County lies a natural wonder that has fascinated experts for decades. The Xiaozhai Tiankeng sinkhole is vast. Probably formed centuries ago by collapsing caves and underground rivers, teams of explorers have sought to understand its many mysteries for years. Video by Patrick Wong - - - - - Subscribe to BBC Reel: More videos: #bbc #bbcreel #bbcnews