fill it with water by using the lever in an underwater cavern and then swim through the tower to another exit and jump over the fence. this article is intended to provide information to an international audience outside of the us and china. from the mouth of the cave, a short uphill walk took us to a viewpoint over ha long bay. when it does work it's usually because they have cooked with me (sometimes they will cook something and then not want to eat it though!) any other tips you'd like to share? to check for available student seats, click here. 