The replica of the cave (1200 m2) is a work apart; a metal frame will hold the projected mortar. It will then be carved to remind the walls of the original cave. Niches will be created and the reproductions will be embedded in them.
The construction of the project is currently underway with 80% of the structural work achieved. The concrete walls, the height of which varies from 8-15 m and angle of 2 ° to 9 °, are still visible and the walls and nailed Parisian who founded the hillside building. For concrete in the most natural appearance possible, everything is cast in place. The next step is the realization of the architectural fascia 170 m long. In concrete, it will cling to a metal structure placed on two poles 6 m high. The roof, the level, the right of the rear wall, equal to that of the natural terrain, will consist of a complex consisting of a metal frame made of beams about 1.20 m high and collaborating bins. The whole is covered with a complex vegetated which has undergone an ATEX.