Introduction to Maoqi Cave: Maoqi Cave is located between Dashiwei Tiankeng and Shenmu Tiankeng. It is the ground channel of the underground river. The underground is connected with Baidong Tiankeng, and the diameter of the ground hole is only more than ten meters wide. Looking at the railing at the entrance of the cave, the black hole below is unfathomable. Due to the difference in temperature between the inside and outside of the cave, air columns are formed: when the air flow rises, white gas emerges, and when the air flow drops, a cyclone is sucked down. This cave is deep and dangerous. According to the administrator's regulations, only explorers with exploration qualifications can go down.