The two last chambers of the itineray, brought to light in 2002, were subject to an infinite number of adaptations and transformations which make it extremely difficult to interpret both their original use and their later modifications.

Archaeologists have suggested that they were used for keeping animals, as a necropolis, an enormous unfinished cistern, a settlement of dwellings, a dye-works, a tannery, and even as a baths complex.

Fortunately, however, the presence of two niches with side basins msuggest that this was a necropolis excavated from the rock; in fact, almost identical structures are found in the older tombs of Norchia, in Lazio, which also have other similarities in common with these chambers, such as the horizontal channels along the walls and a multitude of holes cut into the tufa.

The rarity of such a discovery lies in the fact that until a year ago burials pre-dating the period of Etruscan settlement at Orvieto, had never been discovered in the area