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4. Kansai Airport in Japan
To begin with, this airport is located on the artificial island of Osaka Bay. Its length is 4 km and a width of 2.5 km. This airport seems to be quite an ordinary building (especially as for Japanese engineers), if you do not take into account the fact that in 1994 it sank as much as 50 cm into the water. Now the drawdown speed has been significantly reduced, having resorted to vigorous actions and having spent more than one billion dollars, but even these efforts do not add reliability to this airfield.