The passages at the first floor of the last cave, which used to lead the spaces under the Palazzo Filippeschi, are of the same structure and orientation as those found at the bottom of the Pozzo della Cava.

The small channel cut into the floor served to carry water to various collection points.

The singularity of the structure lies in the fact that this channel along the tufa wall, instead of towards the centre of a cistern, as is usual in similar Etruscan structures.




During the Second World War this passage was used as an air-raid shelter.