Beneath the vast limestone landscapes of southern China lies a hidden world: colossal cave chambers, underground rivers, and mysterious tunnels — many of them still undocumented and unexplored. Join expert caver Leo Jia and her international team as they descend into Cloud Ladder Hall — one of the largest cave chambers on Earth, rumored to create its own cloud system. Armed with cutting-edge 3D scanning technology, the team braves vertical drops, narrow shafts, and complete darkness to unravel the science behind underground weather. This episode of Underworld explores China’s most spectacular caves, including the Meow Room — large enough for a Boeing 747 — and uncovers the secret forces shaping these giants from within. Along the way, the team encounters ancient nitrate pits linked to early gunpowder production, underground rivers, and turbulent airflows that may hold the key to one of nature’s strangest phenomena: clouds forming inside a mountain. Blending science, danger, history, and high-tech exploration, this documentary takes you deep into one of the last frontiers of the natural world — before it disappears forever. #documentary #caves #exploration #china #climate #science #underworld #adventure #geology ---- The universe is vast, much like our imagination. In "space and science", we show you various documentaries and highlights from outer space. No matter if stars or planets, meteoroids or black holes, relax and enjoy our content! :) ---- Other channels you might be interested in: criminals and crimefighters: https://www.youtube.com/channel/UCYuXyzwA_w4-c1FJrqOnR0A hazards and catastrophes: https://www.youtube.com/channel/UC5WE_bClugxSVG1ENir8qzg