The central gallery, the longest (36.60 m), is approximately 3 m wide in the initial section, expands in the central section to accommodate imposing burials and narrows in the final section. Its floor is occupied by 55 pits arranged in an East-West direction. The last section of the gallery is occupied by arcosoli with inverted axis, often monumentalized for the choice of accurate decorative solutions with small arches, lunettes, molded pillars or even undecultoreous reliefs of which some traces remain. This second phase dates back to the 4th century.