The document discusses the future city of DON City, which is proposed as a floating city to avoid destruction from a predicted major earthquake. The city would be shaped like a doughnut and supported by two zeppelins filled with helium gas. One zeppelin would support the weight of the city while the other provides lighting. The floating nomadic design aims to allow the city to avoid disasters by moving as needed. The proposal aims to provide a safe new home for 250,000 people displaced by the impending earthquake.