The Lot 5A contract, commissioned by Tunnel Euralpin Lyon Turin (TELT), is located at the center of the planned 57.5-kilometre base tunnel between the train stations of Susa in Italy and Saint-Jean-de-Maurienne in France, and it consists of preparatory works for the future safety site at Modane. The excavations will create a logistics hub 500 metres below ground ahead of the drilling of 18 kilometres of tunnel under the Ambin Massif in the direction of Italy.

The Group will develop the project with joint-venture partners Vinci Construction Grands Projets, Dodin Campenon Bernard, VINCI Construction France and Bergteamet. Webuild has a 33% stake.

By 2030, the Turin-Lyon link will take enough trucks off the roads to contribute to the reduction of the equivalent of three million tonnes of CO2 each year.​​