THE CAVE DI CUSA SICILY ANCIENT LOST TECHNOLOGY OF LIMESTONE CUTTING

The mysterious circular stone carvings over 3 meters wide of limestone columns.

I made another video with insta 360x3 where you can clearly see the spiral cut lines as the drill moved about 6-8cm per revolution!

It must have been an incredible cutting force
It is obvious to me that the columns have been cut by some kind of drill lost over time..

The spiral groove marks are clearly visible to this day.

1 circle gains about 6 to 8 cm per rotation in the limestone. It is a very effective and powerful exercise.