After digging a little more than two kilometers from the entrance, the companies have to solidify the ground before continuing. At other sites, the arrival of the tunnelers is prepared, but on some sections, the base tunnel has already its final aspect. Travel underground, at the heart of the construction site.
After digging a little more than two kilometers from the entrance, the companies have to solidify the ground before continuing. At other sites, the arrival of the tunnelers is prepared, but on some sections, the base tunnel has already its final aspect. Travel underground, at the heart of the construction site.