Groundbreaking Innovation

We provide innovative solutions to some of the largest, most complex tunnel, and underground construction projects in the world. Our experts are dedicated to overcoming the toughest challenges to help our customers move safely under or through any obstacle.

Years Of Expertise

For more than 70 years, we have planned, designed, engineered, built, and managed complex tunnel projects ranging from transit systems to sewers and pipelines, in challenging geologic environments from seismically active southern California to the alluvial littoral of the Chesapeake Bay. Our unparalleled experience includes more than 250 tunnels and ocean outfalls around the globe.

We serve the underground engineering and project/program management needs of a diverse domestic and international clientele, lending our expertise to projects such as underground utilities, water storage, and transportation tunnels, and underground buildings. We offer a host of cutting-edge tunneling techniques and technologies to minimize the risks associated with underground structures of all sizes and levels of complexity.

Integrated Capabilities

Our underground construction experience ranges from small excavations to large underground transit systems, water and wastewater infrastructure, and hydroelectric projects. We utilize the latest approaches, including 3D modeling, BIM, conventional and machine-bored tunneling to deliver first-of-a-kind projects and processes.

We can provide a single source of integrated capabilities for:

• Planning
• Tunnel and tunnel system design
• General consulting
• Project and construction management (PM/CM)
• Program management
• Geological investigations
• Geotechnical engineering/ Geotechnical monitoring and instrumentation
• Risk Management and Resiliency Analysis
• Tunnel repair, inspection, and refurbishment
• Trenchless and microtunneling
• Seismic analyses
• Design-build/P3
• Construction engineering services
• Commissioning
• Value engineering
• Constructability reviews

We have provided advisory services, performed subway construction, and delivered major underground infrastructure/tunneling projects, including the Southern Nevada Water Authority Lake Mead Intake 2 and 3, New York Department of Environmental Protection’s Delaware Aqueduct Bypass Tunnel, and the English Channel Tunnel. 

We deliver innovative infrastructure that incorporates sustainability and resiliency to serve the needs of communities for years to come. As an integrated solutions provider, we are experts in alternative project delivery methods, including design-build (DB), public-private partnerships (P3s), and design-build-finance-operate-maintain (DBFOM). No matter the challenge, we do what it takes to get the job done.