saving this before the old forum dies — guy claims the Longyou caves were cut by 'something with a blade'

Pulling this off a half-dead Chinese mystery board, original poster's images are all 404 now so I'm archiving the text.侵删 if it's yours. OP: "In 1992 four farmers in Shiyan Beicun, Zhejiang, pumped out a pond they thought was bottomless. Underneath = a man-made sandstone cavern. Then they found 23 ……