WSP has one of the longest standing and extensive tunnelling practices globally. In both rock and soft ground, we build transportation, water, and utility tunnels, and underground spaces.



Tunnels transform transportation networks by linking nations, uniting communities and reducing travel time. Water and wastewater make modern hygiene and sanitation standards possible. Utility tunnels bring us our electricity, telephone, internet, and gas pipelines, enabling us to power our lives. Underground spaces contribute to our transport networks, our energy reserves, our sustainable development in the face of  growing urbanised populations and our scientific research. Tunnel design and construction requires a wide range of engineering skills to deliver innovative solutions.

Bringing together all required disciplines under one roof, WSP is a world leader in tunnel planning, design, rehabilitation and construction. From pre-feasibility, through fire and risk engineering and ventilation systems, to detailed design and maintenance, we offer in-depth expertise throughout the tunnel lifecycle.

Our hands-on experience includes all types of tunnelling—rocksoft ground, segmental, cut-and-coverimmersed tunnelsmicro/trenchless, and the New Austrian Tunnelling/Sequential Excavation Method. Our engineers have worked on a wide variety of underground construction projects around the globe, from road tunnels  and systems, to underground nuclear waste repositories and water conveyance systems.

On all projects, WSP builds teams that exceed expectations, develop solutions through dialogue and creativity and have the ability to look beyond the obvious in cost and value optimisation. Our spirit of achievement has been nurtured through our partner-driven and client-focused approach, ensuring that we deliver the best value, from inception to completion. We accomplish this by implementing  innovative, straightforward solutions and bringing together our lessons learned from an extensive portfolio of major projects. The result is a reputation for design and delivery excellence, and industry-leading expertise.

Full lifecycle services

We provide comprehensive services for every aspect of the construction of tunnels and underground projects, including tunnel design, ground improvement, initial and final support, instrumentation and monitoring, water control, tunnel systems and ventilation/fire life safety aspects. Our expertise provides support across an entire project, from feasibility, to design, to construction management, to testing and commissioning. We also provide condition assessments, refurbishment, reuse, and upgrading of tunnels and underground facilities.

Tunnelling project success is intrinsically linked with the ground and ground water, and accurate site investigation is the best way to prevent surprises and delays further down the road. Our geotechnical experts have dedicated years not only to the practice, but also to research in order to continuously build upon our understanding of ground behaviour during and after excavation. The result is an unparalleled breadth of acumen that continues to improve our ability to construct underground facilities without disturbing existing facilities and utilities, to ensure that our work doesn’t impact the surrounding environment.

Technology-driven design

Our design teams work extensively with the latest technologies, including numerical modelling of ground/structure interaction, building information modelling (BIM) and Virtual Design and Construction. This allows us to perfect schematics in virtual reality, allowing problems to be avoided before ground is broken and reducing the likelihood of issues arising during construction that can cause delays, extra costs or damage to surrounding structures.

Our wide-ranging expertise in railroads, power, water and aviation means that we understand tunnels from all sides of the project, resulting in a holistic approach to their design and construction.