CALTROP’s global network of professionals apply their knowledge to roadway, metro and rail tunnels, underground and surface stations and other projects that help keep people and goods on the move. We provide services on a wide range of underground projects – from program and project management, pre-bid constructability analysis, claims assessment and avoidance, risk assessment and management to on-site supervision. Our experts have the insight and knowledge to provide innovative solutions to tunneling challenges including bored tunnels, immersed tube tunnels and cut and cover tunnels, serving a diverse domestic and international clientele for underground metro, hydro, oil storage, road and rail tunnel projects. Our expertise encompasses the full range of underground construction, in all conceivable ground conditions, from soft ground through, weathered or tectonized rock, to hard rock. Our staff is fully experienced in NATM, drill and blast, cut and cover tunneling methods as well as mechanical shield and both hard rock TBM and soft ground EPB excavation.