46.60 euros per water line: the XXL swimming pool at Maurepas and Élancourt considered far too expensive for schools. “Knowing that we need three corridors for a single class, or a bill of 139.80 euros per hour, we go there very, very little,” illustrates Marc, PE teacher at the 7-year-old high school.

Almost our entire educational budget goes there, around 80%," says Maxime, another PE teacher, who works at the Clef-Saint-Pierre college.