The Westerschelde tunnel ensured the first safe connection between the provinces of Zeeuwsch-Vlaanderen and Zuid-Beveland in the Netherlands. High water pressures in connection with loose soil posed new challenges to tunnel construction.
47 km sewerage tunnel across the Ruhr area
Greatly varying geology required different driving methods during the construction of the Uetliberg Tunnel in Switzerland. The 4.4 km long road tunnel connects the Birmensdorf bypass with the existing national road Zurich-Chur.