This photograph taken on April 23, 2024, shows the decantation room and UV treatment inside the Departmental River Water Treatment Station in Champigny-sur-Marne near Paris. It is one of five engineering projects that the Paris region is undertaking to clean up the Seine and Marne rivers to allow Swimming events to take place during Paris 2024 Summer Olympics. Photo by Raphael Lafargue/ABACAPRESS.COM