Contract work consisting of the excavation and application of primary support for 1900 m of tunnel with a section varying from 77.21 to 103.90 m2 and 1900 m of emergency gallery parallel to the tunnel with a section of 23.89 m2 on the entry side of the la Paz tunnel, which is a total of 3200 m long. Total estimated volume of excavation 195,000 m3, application of concrete 14,000 m3 and 660 tons of steel.