"In May, Paris officials inaugurated a giant underground water storage basin next to the Austerlitz train station aimed at collecting excess rainwater and stopping wastewater from entering #TheSeine. The basin can hold the equivalent of 20 Olympic swimming pools of dirty water that will now be treated and is the centerpiece of major infrastructure improvements that the city has rushed to finish in time for the Games, but to also ensure that #Parisians have a cleaner #Seine in years to come."