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Entrance to road tunnel Underground at Whitechapel Long shot of Big Bertha East Side Access


Our reputation for innovation in tunnel design and engineering is founded on a global portfolio of transport, water, wastewater, power and mining projects, supported by centres of technical excellence in the USA, UK, eastern Europe, Australia, India, Hong Kong, Singapore, and Canada.

Our origins are rooted in tunnelling, dating back to our founders’ involvement in the development of London’s underground rail system at the turn of the 20th century.

From the smallest to the largest, most complex projects, all tunnels have their individual challenges. We meet those challenges by combining knowledge of the ground with design, visualisation, and construction technologies that are right for the job.

Through years of serving clients according to these simple but essential principles, we have delivered some of the most challenging tunnelling projects ever undertaken. We've won awards for innovation and engineering excellence, and in several circumstances, accomplished what others said could not be done.

We tailor our tunnel engineering knowledge to the issues that our clients face. While the ground may not know whether water, vehicles, or trains are being conveyed through a tunnel, our clients do. We offer our tunnel engineering services within a client-based focus.

Today, we continue to be involved in the development of the most prestigious tunnel projects including:

  • Rail, metro and light rapid transit
  • Highways
  • Airports
  • Water and wastewater
  • Utility tunnels

Our tunnelling capability is built on over 100 years of experience. This has equipped us with the design expertise and practical understanding needed to bring our client’s projects from concept to final delivery, whatever the type:

  • Bored tunnels in hard rock or soft ground
  • Tunnel boring machines
  • Segmental lining
  • Sprayed concrete lining (SCL or NATM)
  • Drill and blast tunnel excavation
  • Cut-and-cover tunnels
  • Immersed tubes
  • Trenchless methods, micro-tunnelling, pipejacking and directional drilling
  • Shaft sinking in soft ground or rock
  • Refurbishment of tunnels
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