World Of Walking Cities

Many years ago the world was struck by enormous catastrophe. Nanobots that were used in many different industries got out of control at some point. They was growing in the earth like mycelium. And after that they broke through to the surface trying to entangle any organic. All who can be saved did it immediately. Some of them flew into the cosmos, the second group built settlements floating in the stratosphere, others gone under water. But there were those who stayed and didnt break the connecti...