The underground construction department has comprehensive experience in all categories of tunnel, gallery and cavern construction. Our company has worked in all geological formations in Switzerland so we are thoroughly familiar with the appropriate construction methods, from unstable slopes and in ground water to squeezing rock. Among our references are various gallery systems in the High Alps, large cavern and gallery systems in hydropower schemes as well as long road and rail tunnels. Where necessary we undertake complex rock mechanics computations with threedimensional finite element modelling and non-linear material laws, to optimise excavation and support. Thanks to our ongoing dialogue with contractors and experts in the sector we are able to develop cost-effective and time-saving solutions for logistics and construction.