The structure, with a shape like a nymphaeum, seems to be a cave partly natural and partly artificial, about 9 meters high and with a diameter of 7.5 meters.
The micro camera showed a decorated caisson with geometric forms (not figurative) made in mosaic tiles and polychrome marble, further enhanced by rows of white shells and by the white eagle of Augusto placet in the center of the vault.
It seems that, the Emperor Augusto, built up his dwelling in that place to attach his villa to a so highly symbolic place of the history of Rome.
All happened the 21 november 2007