The mains aim of the 2018 campaign was to complete the investigations in the eastern sector of the building (trench 4), where a vast open area was identified, characterised by the presence of several overlying beaten earth floor surfaces. Continuation of the excavation next to the perimeter arcade of the theatre revealed the original stone paving that ran around the external curved perimeter of the cavea, in continuity with the thresholds of the entrances leading to the substructures already identified both in trench 4 and nearby trench 5. There was a manhole cover in the paving connected to a cloaca below for rainwater drainage. The paving was obliterated in antiquity by a sequence of new floor levels. Similar rises in floor level were also documented in the substructure spaces between the radial walls investigated in trenches 4 and 5. The latest floor level outside the theatre was constituted by an extensive beaten earth floor that was very compact and bore traces of the passage of cartwheels and other activities.

Interesting new evidence regarding the building’s plan emerged from the completion of the excavations in trench 2 and the opening of new excavation area: trench 6 in the eastern sector of the building and trench 7 in the northern sector. In trench 2, a substantial portion of the stone-slab floor was completely excavated at the base of the lower steps of the cavea; the paving covered a cloaca. The paving surrounded the orchestra space, in which a part of a later floor was uncovered. An area of the same floor, including a wall built of reused materials on the opposite side, was also identified in the nearby trench 6. At present, the structure of the original orchestra floor remains unknown. Further east, the stage area was identified, which was largely occupied by numerous architectural elements that had survived the widespread robbing in the post-antique period, and the remains of a stretch of the substantial wall of the scenaefrons, razed to an almost uniform height. In trench 7, what was probably the northern aditus maximus was identified, of which the lateral walls and original floor were preserved, overlying a cloaca probably linked to the one in trench 2, which ran around the orchestra.

The study of the large amount of metalworking waste and of several walls uncovered in previous years, associated with the results of a recent geophysical survey, made it possible to clarify that the external substructures were occupied for a long period after the theatre went out of use. This occupation was mainly connected with metalworking activities.