The grotto is not a natural water-eroded cave as Wu had expected, but obviously a human-made project. The floor of the grotto occupies more than 2,000 square meters, with the tallest point of the cave exceeding 30 meters. The four steles are symmetrically distributed in the cave. However, there is no trace of human movement left in the cave at all, as if its owner had in someway suddenly disappeared.

The discovery of this cave largely encouraged Wu and his companions, who then decided to pump the water out of another four caves. They found the caves were generally the same in structure, differing mainly in scale. The villagers were baffled by these mysterious caves, not realizing that their discovery was going to be the largest manmade underground construction cluster in the world.

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