The Qianhai zone's underground development plan to create an 8-square-kilometer underground city recently received approval from a government assessment team. From 2004 to 2012, the cooperation zone labored to complete the massive reclamation project. It has been hailed by the administration authority of Qianhai as a model of how to improve land use efficiency.
According to the plan, about 1.3 square kilometers of underground space will be used for commerce, culture and entertainment while about 6 square kilometers will be used for transportation facilities and underground passages.
Authorities developing the underground plan learned a great deal from the success of international cities, including Chicago, London and Osaka, according to the planning and construction sector of the Qianhai administration authority.
For example, the city's planners studied the Chicago Pedway, a network of tunnels, ground-level concourses and bridges connecting skyscrapers, retail stores, hotels and train stations in Chicago's central business district.
The Pedway takes up about 2 sq km of space and the pedestrian walkways total about 8 km in length and link more than 40 downtown blocks and 50 commercial and government buildings. The system connects seven subway stations and public parking spaces.