HNTB experts provide innovative solutions for a wide range of tunnels, including cut-and-cover tunnels, tunnel boring machine tunnels, conventional tunneling, sequential excavation method (SEM) tunnels, immersed tube tunnels, shaft construction and micro-tunneling.


Our long and proven history in planning, program management, design, construction management and technical services for tunnel and complex underground structures has resulted in a number of award-winning projects on some of the country’s most challenging programs for transportation infrastructure.


HNTB's capabilities cover a broad range of services and expertise that help our clients and communities meet their goals.

View the Tunnels brochure here.


  • Planning
  • Design
  • Construction management and engineering
  • Project management
  • Tunnel, underground and structural engineering
  • Geotechnical engineering
  • Geology/hydrogeology
  • Tunnel Inspection
  • Instrumentation and monitoring
  • Tunnel rehabilitation
  • Ventilation and fire life safety
  • Operations and maintenance

Featured Projects

Tunnels National Practice Leader

Sanja Zlatanic

Zlatanic holds more than 30 years of experience in project and engineering management of mega transportation, transit and underground projects. Internationally recognized, Zlatanic has successfully led a variety of multi-disciplinary coordinations and integrations of complex underground structures and tunnels. Zlatanic is also an active member of various tunneling and underground societies, and currently serves on the executive council for the ITA-AITES (Internal Tunneling Association).