The inner lining of the already fully excavated first crown can begin using an over twelve meters long formwork carriage. After the sealing of the rock using a film, abutments will be concreted in addition to the partial reinforcement of the vault. A concrete strength of at least 55 centimeters will subsequently be pumped behind the formwork. Overall, 4500 cubic meters of concrete will be placed. From spring 2017, up to 10m depth will be drilled out of the rock, starting from the entrance area and for each of the 4 stories.