The latest Metro development is a service structure called Des Acrobates, which is located in Saint-Denis, in the heart of La Plaine district, in the public park bearing the same name, opposite the Fratellini Academy. This facility is being built entirely underground, at a depth of 40m and once complete only the ventilation grille and the emergency and maintenance access hatches will be visible on the surface.

Following the preparatory works carried out in 2017, Trevi France set up the job site in the spring of 2018. Noise barriers 4m high were positioned on each side of the construction site - rue des Cheminots, Annie Fratellini and Federico Fellini, as well as in the Square des Acrobates park.

The works for the underground walls started in February 2019 and will last six months, before the commencement of the excavation works of the structure. At the end of the works, and after consulting the local residents, the square will then be redeveloped and refurbished.

Trevi France is creating diaphragm walls on the job site, by means of hydromills and grabs. The diaphragm walls being made with the Soilmec Tiger SC-90 hydromill have a thickness of 1,200mm and a depth of 53m, while those made with the Soilmec SC-90 crane have a thickness of 800mm and a depth of 23m.