Introduction to the underground cave: The underground cave entrance of Dashiwei is about 20 meters wide and 40 meters high. In the underground cave, there are huge stalagmites, stone pillars, stone waterfalls, stone curtains, etc. in various shapes and forms, crystal clear, like a huge treasure, covered with The sparkling gems are stunning. There are two underground rivers in the cave, with fast currents, one hot and one cold, which is very strange.