The project includes the construction of a 249-m-long safety shaft that will serve the existing Pinchat tunnel in the municipality of Carouge (Geneva).
It has a cross-section of approx. 4.0 x 3.65 metres. The excavation of loose soil is carried out in covered stages with the laying of variable geometry HEB ribs for about 218.00 m.
Outside, a building providing ventilation has been incorporated into the playground/green area of the municipality of Carouge (Geneva).