Five Subteerranean Cities

The five subterranean cities—Montreal's RESO, Oslo's Sub t, Helsinki's city tunnels, Stockholm's subway system, and the Seoul Metro—are extensive underground networks offering transportation, commerce, and public spaces. Montreal's RESO, or La Ville Souterraine, connects shops, offices, and metro stations beneath the city, providing shelter from harsh winters. Oslo’s Sub t is an underground light rail linking parts of the city. Helsinki’s tunnels accommodate stations, shopping centers, and art installations. Stockholm's subway features elaborate station art and connectivity. Seoul Metro's vast network efficiently transports millions daily and includes underground malls and amenities, exemplifying integration of urban infrastructure beneath the surface.