Work continued in the south-western part of the amphitheatre at Cumae. It had an ima cavea, delimited to the north by an opus signinum floor linked to two vomitoria at the sides of the southern entrance. Four tiers of seats faced with opus signinum have been identified, with stairs of trachyte blocks. Six tiers of the media cavea were preserved, although very patchy, with masonry facing resting directly on the embankment, with dividing stairways of trachyte slabs between the cunea. Due to the severe razing of the upper part of the embankment the structures of the summa cavea were lost, with the exception of the pilaster foundations of the annular wall crowning the amphitheatre, which it is suggested constituted the back wall of the portico in summa cavea.

The excavation of a section of the arena brought to light a beaten earth floor, at the same height as a threshold comprising four elements in limestone and trachyte, situated in correspondence with the south entrance. The high podium wall was probably faced with marble slabs, as suggested by the finds recovered and the presence of regularly distanced holes for clamps

The exploration was completed of the spaces east of the corridor leading to the south entrance: a square room and the eastern sector of the annular ambulatory. The identification of a tract of curvilinear wall in opus quasi reticulatum, cut by the insertion of the side rooms, constitutes an important element for the understanding of the sequence of building phases of the monument. In fact, it was clear that in this first phase the podium wall was further back, and that the masonry built ima cavea was added later, creating the annular ambulatory around the perimeter of the arena and inserting, to the side of the entrance corridor, two pairs of symmetrical rooms characterised by opus vittatum walls.