 He also had the idea of digging a tunnel through the Cammazes ridge to connect the "rigole de la montagne" to the reservoir in the valley without utilizing the Sor river at all.In 1686, the engineer, Marshal Sebastien Vauban, extended the "rigole de la montagne" from Conquet to connect it to the Bassin de St. Ferréol.The path included a long, diameter tunnel at the village of Les Cammazes.