Shuiyun cave and double-door cave are connected. If you don't want to see the other one, you can only return to the original road. Ticket 40 for Shuiyun Tunnel. It's part of the geological museum. There are many introductions of Quarrying and various stone carvings. It gives people a feeling of going underground, always feeling very deep. The water and caves inside reminded me of the picture of Xiao Long Nu bathing in an ancient tomb with its own mist and clear water. Or maybe it's the hint from the Scene View of the Sculpture Swordsmen said at the door. But it's really good for taking pictures of ancient tombs.