The 2018 investigations at the site of the Roman town of Castrum Novum lasted longer than in previous years thanks to the fact that the Západočeská Univerzita di Plzeň (Czech Republic) joined the project. The team from the Museum of the Sea and Ancient Navigation, holder of the concession, undertook two campaigns, the first two weeks with a group from Plzeň University and the second two weeks with a group from the Universities of Lille and Amiens.

During the first campaign, the excavations were extended in some rooms in sector D IV, in particular rooms 2/4. Here a large cistern was uncovered built in fine opus mixtum, of which in antiquity only the vault (not preserved) emerged above ground level. There were clear traces of at least two praefurnia in the immediate vicinity of the cistern, suggesting the existence of a bath complex.

During the September campaign, the gate to the Republican castrum was finally found, at the point which should correspond with the centre of the short east side of the curtain wall. Here, a basalt-paved road crossed the wall in an easterly direction between two wings of structures built in squared sandstone blocks that can be interpreted as the remains of the gate and inner gate.

A very well-preserved section of basalt paved road came to light on the same axis as the gate, at about 25 m west in a newly opened sector (D VII). The carriageway was 3.30 m wide and was flanked by perfectly- preserved kerb stones, also basalt. Further west, towards the geometric centre of the castrum, the remains of a wall that seemed to delimit a space opening onto the road, indeed it has the same basalt paving. What remained of the walls (c. 40 cm in height) were faced with red plaster, as was the bench that ran all around their interior.

Behind this room, to the south, excavation continued in sector V and a new adjacent sector, VIII, was opened by the French team. This established the premise for deepening the investigations in a transverse sense, through the rooms abutting the walls from south to north, as far as the basalt road, whose alignment and dimensions suggest can be considered the decumanus even in the latest phases of the settlement.

In sector D I, room 1 was excavated down to natural and room 2 down to the discovery, immediately below the earliest Roman floor, of an isolated sandstone block identical to those of the Republican walls (120 × 60 × 60 cm). The block was aligned perfectly north-south and was pierced by a square hole through the centre.

In sector D III, the basalt-paved square in front of the south side of the castrum, the excavation was extended thus providing new point of reference for the topographical survey, now able to link all the sectors and provide an overall picture of the excavated remains.