The Frejus tunnel
Razel-Bec will have dug 12 km of tunnel, 18 safety shelters, 3 technical stations, a ventilation plant and 4 bypasses in highly convergent terrain, using all types of digging techniques, from explosives to hard rock tunnel boring machines. It is a project that will have supported the development of Razel-Bec's underground works business and paved the way for the Grand Paris Express project.
