But there is more to this landscape than meets the eye. China has literally thousands of mysterious caverns concealed beneath the visible landscape of the karst. Much of this hidden world has never been seen by human eyes and is only just now being explored. For a growing band of intrepid young Chinese explorers, caves represent the ultimate adventure. Exploring a cave is like taking a journey through time. A journey which endless raindrops will have followed over countless centuries. Fed by countless drips and trickles, the subterranean river carves ever deeper into the rock.