Caves with artifacts were found at the bottom of a lake in China

It became known that ancient caves with artifacts were found at the bottom of a lake in China.

The Caves of the Floating Dragon were discovered after the water in the lake, which was thought to be bottomless, was pumped out.

The discovery of artificial structures completely contradicts history: the entrance to the underground structures was made thousands of years ago.

Presumably, the caves were created during the reign of the Qin Dynasty, that is, in 221 BC.

The average area of each of the 24 caves is more than a thousand square meters.

The technology of production of such volume remains unknown.

And in historical sources there is not a word about the construction or existence of caves.