Montreal’s Underground City, officially called the RÉSO consists of interconnected complexes, both above and below ground, connected by a pedestrian network of over 33 km beneath downtown Montreal. The Underground City and its tunnels connect nearly 1,700 boutiques, 200 restaurants, universities, movie theatres, apartments, metro stations, art centers, museums, arena and more. Although it is called the underground city, it is actually a collection of interconnected complexes above and below ground around downtown Montreal.