A system of underground cuniculi was identified during rescue excavation on a building site.
Of the first tract between two open air wells, 7.67 m apart, only a minimal part of the vault was preserved.
Amongst the few archaeological material recovered during excavation were a number of tiles and bricks, coarse cooking ware, refined plain buff ware and amphorae of late Republican date.

It was clear that the cuniculus followed the slope of the valley, from north to south, in the bottom of which the Fosso di Tor Bella Monaca flowed. Therefore, a cut was made into the bed rock of Tufa di Villa Senni, typical of the volcanic area of the Alban Hills. This intervention revealed a section of the gallery that was almost free of debris and earth. The cuniculus had a typical ogival section, 1.70 m high with a maximum width at the vault impost of 0.60 m, the space necessary to allow a man to work inside it, and a minimum width at the bottom of 0.38-40 m. A little further on the structure narrowed, the height became 1.14 m and the width at the vault impost was only 0.40 m.

At a distance of 36 m from the second well was a third, 1.50 m long and 0.88/0.49 m wide. At the north-eastern end it was joined, as well as by the above mentioned cuniculus, by a second gallery descending from the east and 0.65 m wide. Both cuniculi were completely blocked. On the long sides of the well, as in the previous one, the characteristic foot-holds were visible.
The fill that was excavated produced several tile fragments and an amphora stopper as well as a truncated pyramid shaped tufello, typical of opus reticulatum, with traces of mortar on the contact surfaces.

On the south-west side of the same well was the entrance to a third cuniculus which channelled the waters from the other two downhill.
In this case the vault was almost flat; the gallery was 1.80 m high, it was 0.65 m wide at the impost and 0.40 m wide at the bottom.

In conclusion, given the rural context this hydraulic system was used to collect and channel surface water towards a ditch downhill; the latter was identified during the investigation of an area south-east of this one.
The first two wells found, which opened at the bottom of a ditch like a sort of swallow hole, channelled the waters into the subterranean gallery. The third, at the meeting of the two cuniculi, provided access for necessary maintenance.