A Chinese company wants to build an underwater city. You'll never have to worry about the sea levels rising for sure. The China Communications construction company commissioned AT Design Office to plan the ocean metropolis.

The decision to pursue the project is still pending for now. According to architect Slavomir Siska, the city is entirely doable using the same techniques they are using to build the bridge.
Part of that bridge is an underwater tunnel, which is joined by a 150-metre-long precast concrete box. The mega box is cast on a nearby island and floated to site before being connected. We were appointed to work with the engineer to come up with a masterplan for a 10-square-kilometre floating island that can be built with the same technology.
Check out some concept pictures:

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