Construction of diaphragms in reinforced concrete with a rectangular section, 27 meters deep along the central body of the station, and 8-9 meters deep along the side exits of the Poggioreale station. Execution of a jet-grouting bottom plug in the station area and at the side exits, with length of 5 or 11 m and drilling depth up to 32 meters, due to the presence of ground water at a depth of approximately 6 m. Jet-grouting consolidations for the excavation of tunnels under the monumental cemetery of Naples, with columns having diameters of 1.000 mm, and a 50° and 80° inclination.