Work started 16 May on the construction of Romes third metro line running between Piazzale Clodio and Pantano (Casilino). According to the company managing the project, Roma Metropolitane, the first archeological investigations are being carried out on section T4-T5 between S. Giovanni and Alessandrino; near Centocelle, and on T6A section between Alessandrino and Torre Angela: Construction sites have been set up in via Sannio in S. Govanni, via Teano in the Prenestino area and via Walter Tobagi in the Casilino area: These investigations are expected to be completed in a few months.

Further work will be carried out in July in additional parts of S. Giovanni, in the historic centre and in Prati. Specifically, the investigations will be carried out in viale Mazzini; viale Angelico; via Ottaviano; piazza Paoli; piazza della Chiesa Nuova, S.Andrea della Valle and near the Sapienza for the T2 section which links piazzale Clodio/viale Mazzini; and piazza Venezia; and in piazza Venezia, via Cesare Battisti; via dei Fori Imperali, via dell'Amba Arada, and piazzale Iponnio for section T3 which connects piazza Venezia and S.Giovanni.

Initial digging of the line, which is expected to incur construction costs of around 3 billion, is scheduled for January 2007 starting on the S. Giovanni-Alessandrino section. The S.Giovanni-Alessandrino section of the line is anticipated to be running from March 2011:

The piazza Venezia-Clodio Mazzini section is expected to be completed by November 2013 and the Clodio Mazzini-Pantano section by August 2015.