Work on the Siete Aguas- Buñol section of the La Cabrera tunnel in Valencia, being built by FCC and Sando in a temporary joint venture for ADIF, saw the installation of 45 1,6 m rings in one day, a world record. This equals 72 m of progress -on 20 November 2007- by the Herrenknecht AG double shield boring machine, out of the total length of 7,157 m of two single-track tunnels. Never before has this length been achieved with this 2,400 tonne, 200 m long, machine which simultaneously bores the tunnel and installs the its lining rings.

The work forms part of an 11.2 km section of the Madrid - Castile La Mancha - Valencia region - Murcia region high speed line and runs entirely in the province of Valencia, crossing the municipalities of Siete Aguas and Buñol. It starts 2.6 km south east of the centre of Siete Aguas and runs west - east, ending to the north west of Buñol. It includes two viaducts and three tunnels built using various methods depending on the ground's geological properties.

The viaducts are the Hondo de Messegar viaduct, 224 m long, with six spans of 32 + 4 x 40 + 32 m and the Rambla del Gallo viaduct, 50 m, with two spans of 25 m. The former is built with a post-stressed deck with single cell box section 14 m wide and a constant depth of 2.70 m; the maximum height of the hollow 2.5 x 5 m rectangular cross section pillars is 23.7 m. The second viaduct consists of a post-stressed concrete deck 18 m wide on top and 10.90 m wide below with two 2.95 m overhangs and with a constant depth of 2 m, supported on a 10.9 m high pillar formed by two 1.50 m square section shanks.

The three tunnels are the Siete Aguas artificial tunnel, 424 m long, the La Cabrera tunnel 7,157 m long (two parallel single track tunnels) and the Buñol mine tunnel, 1,391 m long. The last two also include false tunnel sections at their mouths, 98 and 11 m long for the La Cabrera tunnel and 14 and 453 m for the Buñol tunnel.

Excavation work was designed and carried out to cause the least possible environmental impact taking the existing corridors and environmental conditions as well as bird nesting seasons into account.