Doha Metro Gold Line Underground project that was started in 2014 has been completed and has opened to the Public on November 21, 2019 Within the scope of Gold Line Underground project, a tunnel of 22.841 kilometers of length has been constructed with an excavation diameter of 7,15 meters. 128.000 tunnel segments were used along the line.
During the construction of the tunnels 6 Tunnel Boring Machines (TBM) were used simultaneously.
2,5 million cubic meters of excavation was made for just 10 underground stations.