A four-square-mile, self-sustaining floating city has been designed by British and Asian architects. Living spaces, a hotel and roads would be built underwater, and a cruise-ship dock would be available above water. If the city is built, it will rely on the technology being used "to build a 31-mile bridge between Hong Kong, Macau and Zhuhai," according to this article. "Part of that bridge is an underwater tunnel which is joined by a 150-metre-long precast concrete box," explains Siska Slavomir, architect at AT Design Office.

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