"Kansai International Airport" is also known as Sinking Airport.

Located 5 km off the coast of Osaka, Japan, is the Kansai International Airport. 
The airport is built entirely on a man-made island, 4 km long and 1 km wide. 
The only link between the island and Osaka is by the world’s longest 2-tiered bridge.
 Although the airport is built to withstand earthquakes and typhoons, the artificial island 
itself is sinking faster than anticipated. The episode looks at the various measures 
that are taken to keep the airport ‘afloat’, and the various facilities and services available 
to keep the airport running.