How will the tunnel be built?

The tunnel will be built using the "traditional method", i.e. with a mechanical shovel and with the help of specific tools for drilling rocks. After the tunnel has been dug, unstable earth and rock blocks will be detached to prevent further damage. A support will then be put in place; It serves as a shell for the tunnel and prevents possible subsidence of the ground. At the end of the work, the access roads to the Juvisy-sur-Orge Town Hall will be renovated.

Tunnel drilling in stages using technique adapted to the local situation