For 40 years, SWS has been leading the Civil Engineering sector. Designer of the longest rail tunnel in the world, SWS has 18 offices worldwide, 3 trademarks, 5 patents and copyrights, and has engineered 1300+ km of railways, 650+ km of tunnels, 1900+ km roads, 3 mln sqm of buildings and dams for 5300+ mw of hydro energy, but is in tunnelling where SWS is the solution for most challenging works.