C226 I Can't Understand

It's hard to imagine, deep in the sea, To have such a masterpiece. Clot was almost certain that it was not man-made. After all, black crystal rock was famous for its hardness. Who could cut such a large cave? There were a large number of sea beasts in the deep sea, even if it was a Six Star Blood Kill. It's not possible to dig such a big hole here, is it?

After all