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
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