Preliminary, detailed design and engineering services during construction of the underground tunnel approach structure (for TBM) of the new line C of the Metro in Rome. The structures of overall length in plan of about 180m consist in open U-shaped and an underground approach structure which are all composed mainly by retaining piles wall, prefabricated props and RC casted in place. The project includes also the predisposition for the launching structures for the TBM machine and a 22m concrete bridge above Tor Sapienza trench.