O Curro tunnel excavation endedThe 110 sq m twin-track O Curro tunnel, at 840 m, is the longest of the eight planned tunnels on the 13.2 km Silleda (Dornelas) to Vedra-Boqueixón section of the high-speed line from Ourense to Santiago, Spain. O Curro tunnel is located in Silleda municipality of Pontevedra province. NATM techniques were used, followed by drainage works, sealing and coating. For more, click es/45. 44/09