How was Chaoyin Cave formed?

Chaoyin Cave is located in front of Zizhulin Temple in the southeast of Putuoshan Island, at the foot of Longwan. The cave is half submerged in the sea, about 30 meters deep, and about 10 meters deep from the cliff to the bottom of the cave. The cave is filled with staggered rocks and canine teeth, which cannot be accommodated. The coast here is zigzag, with rugged cliffs and layers of strange rocks. The bottom of the cave opens to the sea, and there are two gaps at the top, called skylights. In the 38th year of Emperor Kangxi's reign in the Qing Dynasty (1699), the imperial book "Chaoyin Cave" was engraved on the cave wall.