Concept of an Underground City and Skyway Systems

An underground city is a network of tunnels that connects various buildings below the street level. These may include office blocks, metro stations, underground shopping malls.

Montreal's Underground City Network
Montreal's Underground City Network

Underground structures or networks are usually found in countries with cold climate. For example, the temperature in Canada in winter is -10 degree Celsius. The climate in Canada does not permit free movement over ground. That is the reason for the development of underground cities. Montreal’s RESO is the world’s largest Underground city in Canada. It is popularly known as “Double Decker City“.

Underground cities usually have entrances through public spaces. The underground structure rises over ground and provides for a proper entrance to the underground structure.

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World’s Largest Underground City | Montreal’s RESO, Canada

Montreal Underground city and Over ground city – Double Decker City

Montreal is the Second largest city in Canada and the largest city in the province of Quebec. The name Montreal has been taken from Mont-Royal which is the triple peaked hill located in the heart of the city.

Underground Metro Station
Underground Metro Station

Montreal is also the world’s largest underground complex in the world. It is also known as the indoor city. Montreal is the network of interconnected complexes underground. But entire city is not underground. There are certain parts which are overground. Since Montreal has both overground city complex as well as underground city complex, it is popularly known as “Double Decker City” or “Two Cities in One”. The interconnections between different complexes that are underground has been achieved through the construction of tunnels. The tunnels are technically and architecturally sound. They have conditioned air and good lighting to create comfortable environment and make it aesthetically pleasing.

Read moreWorld’s Largest Underground City | Montreal’s RESO, Canada