An AI-generated video shows a crowd of young - mostly black - men, wearing balaclavas and padded jackets, slipping down a water slide into a dirty swimming pool with litter bobbing on the surface. The caption describes the scene as a taxpayer-funded water park in Croydon. It is one of a wave of deepfakes showing often absurd scenes of urban decline, and regularly purporting to be in the same south London neighbourhood. Dozens of copycat accounts have begun producing similar content and