IN NUMBERS THE ADVANCEMENT OF TUNNEL BORING MACHINES ACCIONA is one of the leading companies in the use of TBMs for infrastructure mega projects. Its R+D in geotechnics is helping to make them the safest and most efficient excavation technology. Having bored more than 800km of metro, railway and highway tunnels, the company is a leader in adapting and managing TBMs. It has participated in record-setting projects, including the Follo Line (Norway), the metro systems in Quito and Sao Paulo, the Legacy Way freeway tunnel in Australia and the tunneling of the M-30 in Madrid. • It is one of the few companies to have its own Tunnel Boring Control Center, where it monitors more than 4 million pieces of data every day for each TBM (some 45 terabytes per year). • 65,000 sensors send data every 250 milliseconds, from thrust force and rotational speed to engine power consumption. This information makes it possible to digitally simulate the operation, optimize it and perform predictive maintenance. 2 on Line 6 of the Sao Paulo Metro: 12.4 km of excavation. 2 on the expansion of the Vancouver Metro: 10 km of excavation. 1 on the transfer of the Mularroya Dam (Spain): 13 km to be excavated. 1 on Line 9 of the Barcelona Metro: 2.7 km. 1 on Line 11 of the Madrid Metro: 7 km. 2 on Sydney Metro West (Australia): 20.5 km. 2 on the Harbour Tunnel (Australia): 13 km. 1 on Highway S-19 (Poland): 4.5 km. Between now and 2026 it will make use of 12 TBM with diameters ranging in size from small (3.5m) to large (16.5m):