The project consists of an 8km tunnel excavated using a 4.57m diameter EPB TBM, two adits, a connecting tunnel excavated with conventional method and a shaft. The alignment includes flooded or damaged existing sections, new excavations, and different geologies.
This has required a complex design and preparation of the boring machine to overcome any possible difficulties during the excavation as well as its complex geological alignment. The rings for the internal lining have been placed in all sections, so as to obtain the same dimension throughout the entire alignment and guarantee a correct flow of water throughout its length.