WestConnex New M5

Sydney, Australia

The WestConnex New M5 forms part of the largest road infrastructure programme delivered in Australia in recent years, designed to connect western and south-western Sydney with the city centre, port and airport through a high-capacity motorway network.

CSST – Combined Sewage Storage Tunnel

Ottawa, Canada

The Combined Sewage Storage Tunnel (CSST) is a key component of the Ottawa River Action Plan, developed to improve river water quality by reducing wastewater discharges during periods of intense rainfall. The project consists of two underground tunnels designed to operate both as wastewater collectors during normal conditions and as stormwater storage tunnels during peak flow events, helping prevent direct discharges into the river.

Barcelona Metro - Lines 9 and 10

Barcelona, Spain

The Barcelona Metro Lines 9 and 10 project is one of Europe's most innovative urban railway developments, based on the Continuous Station Concept, which integrates stations and tunnels within a single large-diameter structure. DRAGADOS has participated in the construction of several sections of the Lines 9 and 10, a landmark project that incorporates the Continuous Station Concept. The company has delivered three separate contracts covering the sections Gorg – Sagrera Shaft, Sagrera Shaft – Habaneras Extraction Shaft, and Zona Franca – Mandri Station, the latter currently under construction.

Guadarrama Tunnel

Madrid, Spain

With a total length of 28.7 km, the twin-bore Guadarrama Tunnel is the longest railway tunnel in Spain and one of the longest in the world. It was also the first tunnel of this scale to be constructed without intermediate access points, presenting a major technical and logistical challenge. The tunnel reaches a maximum overburden of 992 m beneath Peñalara Peak, while the crossing beneath the River Eresma was completed with a minimum overburden of just 22 m, highlighting the significant variation in ground conditions encountered along the alignment.

Lima Metropolitan. Lines 2 & 4

Lime, Peru

The Lima Metro – Lines 2 and 4 is the largest underground transport infrastructure programme developed in Peru, incorporating more than 33 km of tunnels, stations, ventilation shafts and railway facilities within a high-capacity metropolitan network. The project is being developed under a 35-year concession model, covering the financing, design, construction, operation, and maintenance of Line 2 and a branch of Line 4 connecting to Jorge Chávez International Airport.

Madrid Metro Extension

Madrid, Spain

Line 11: Plaza Elíptica – Conde de Casal The Madrid Metro Extension Programme represents one of the largest underground transport developments undertaken in Europe, delivering more than 165 km of new lines and 168 stations between 1995 and 2011. DRAGADOS is currently delivering the extension of Line 11 of the Madrid Metro, along the section between Plaza Elíptica and Conde de Casal. The contract includes the construction of 7 km of single-bore, double-track tunnel, with an excavation diameter of 9.38 m, executed mainly using an EPB tunnel boring machine, launched and operated from Comillas station towards Conde de Casal. The project also comprises the construction of five new stations —Comillas, Madrid Río, Palos de la Frontera, Atocha and Conde de Casal— together with seven emergency exits, six ventilation shafts, and five pumping shafts, integrated into different structures along the alignment.

Parallel Thimble Shoal Tunnel (PTST)

Virginia, USA

The Parallel Thimble Shoal Tunnel (PTST) project eliminates a major bottleneck on the Chesapeake Bay Bridge-Tunnel, one of the most iconic pieces of transportation infrastructure in the United States.