, the capital's first self-driving line, commissioned by Roma Metropolitane and built by the consortium company Metro C S.c.p.a., led by Webuild and Vianini Lavori (other members Cooperativa Muratori e Braccianti di Carpi, Consorzio Cooperative Costruzioni, Hitachi).

The hydro-milling machine combines complex technology and multifunctional design that will enable faster work times, greater accuracy and operability in smaller spaces, and reduced surface noise and vibration. 

The machine, with a height of 24.5 metres and a weight of 185 tonnes, will work vertically making use of a high-pressure water jet. It will be used to build approximately 55 cubic metres of reinforced concrete perimeter diaphragms of the station, reaching a depth of 85 metres. The perimeter diaphragms will allow to create an hydraulically isolated box that will make it possible to excavate inside the station with the maximum safety. Its activity will continue in the forthcoming months concomitantly to the other site works, which have already started in the central part of the square, like the archaeological coring.