Introduction to the ancestor worship inscription: The middle hall of Gaxian Cave is slightly smaller than the front hall. There are several large stones on the ground, which are the remains of stone tables and stone chairs used by the ancients. The back hall turned to the west, with a steep slope, and the ground was covered with rocks. It became darker and darker as you walked in, so dark that you couldn't even see your fingers. Under the illumination of the searchlight, only two niche-shaped holes were visible above the cave wall. There is also a fork above the turning point between the front hall and the middle hall. The inside of Gaxian Cave is winding and deep. The mottled rock walls show the vicissitudes of the ancient cave.