For over a century, swimming in central Berlin’s Spree River has been banned as a consequence of hygiene considerations. Now, campaigners from Flussbad Berlin are difficult that rule — not with placards, however with paddles. As city waterways in cities like Paris and New York open to swimmers, Berliners argue it’s time their metropolis adopted swimsuit. With improved water high quality and local weather change driving the necessity for city cooling, may the capital lastly raise the ban?