Dallas Campbell and Dr. Hannah Fry investigate what it takes to get a million people and their luggage off the ground and up in the air. From building the world's biggest passenger plane to navigating through the busiest airport on the planet, to the perils of getting airborne in the coldest city on earth - Dallas and Hannah go to extremes to get under the skin of the remarkable story of departure. You will never look at flying in the same way again.
Runtime: 60 minutes
City in the Sky - Sky City (Changsha) - Netflix
Sky City (Chinese: 天空城市; pinyin: tiānkōng chéngshì), or Sky City One, was an 838-metre-tall (2,749 ft) planned skyscraper in the city of Changsha, Hunan in south-central China. The prospective builders, Broad Sustainable Building, estimated it would take just 90 days to construct. Including the 120 days required for prefabrication before on-site work commences, the sum of time needed is 210 days. Pre-construction activities were halted in August 2013 after government regulators required additional approvals. Broad Sustainable Building had intended to build a 666-metre (2,185 ft) skyscraper, but the local government wanted the world's tallest building, hence the current plans. The company has constructed 20 buildings in China using the same method and has several franchise partners globally. It has a planned helipad at a height of 739.8 m (2,427 ft) above ground. As of May 2016, plans for the building's construction are stalled, and the foundations for the planned building are being used as a fish farm. On June 8, 2016 it was reported by the People's Daily that the project had been dropped due to protests over environmental damage to the Daze Lake wetland. The People's Daily said, “Central China's Hunan province finally announced a halt on its ambitious plan to build the world's tallest tower within one part of its rare wetland area. The Daze Lake wetland is the location where the world's next tallest tower was originally scheduled to be built. This wetland is now listed as one of the 20 waters to be permanently protected and will follow non-construction zone policies. It is a pristine wetland hailed as the last wetland in Changsha where many rare bird species take habitat. Shelter of these birds would be largely disrupted by the building of this tower.” However Broad Group declared: “We will definitely build the tower”.
City in the Sky - Criticism - Netflix
The project faces a great deal of skepticism due to the nature of its claims, and doubts have been expressed about Broad Group's ability to complete such a project in such a short time. There is also speculation that it is a marketing ploy rather than an actual project. The head of structures for WSP Middle East (the company behind The Shard in London), Bart Leclercq, jokingly said that he would give up structural engineering if the project were completed on time. Even so, he and others have commended the project for its use of innovative prefabrication techniques. Doubts have also been cast by critics over the ability of the Broad Group to achieve such a grand scale project, especially since they had previously constructed only two buildings, neither of which is over 30 floors. A tower of such height requires stiffness, which in turn would require enormous amounts of concrete and steel and a lengthy period of time for it to settle. The ability of the engineers to understand the complexity of a project this size has also come into question. (The later Mini Sky City is 57 stories, and took 19 days of actual build time, see above.) Another factor that may have been overlooked in the designs, according to engineers, is the wind factor. A building with such a height and shape will need to deal with large horizontal forces, but a wind strategy seems to be absent from the Broad Group's blueprint on the tower. Because of a lack of stiffness, winds would generate a huge draft around the building and would cause it to sway, making it potentially unstable. Other concerns by critics have related to the tower's ability to deal with emergencies. In case of a fire, there might not be means to douse it or to evacuate people as fire rescue crews are generally not equipped to reach such heights. Also, the elevators might be too slow to transport people who need emergency treatment to the hospital in time (though the building is planned to include a hospital). Finally, the structure may also cause subsidence in the local soil. While Dr. Sang Dae Kim, chairman of the Council on Tall Buildings and Urban Habitat, has claimed that towers up to 2 kilometers are possible with modern technology, he has said that the floor to elevator ratio at that height would be impractical.
City in the Sky - References - Netflix