CNN:

(CNN) -- What would happen if the legend of the Lost City of Atlantis was crossed with the screenplay of Kevin Costner's 1995 hit movie "Waterworld"?

Maybe something like The Ocean Spiral -- an underwater metropolis that generates energy from the seabed and is capable of providing homes and accommodation for 5,000 people.

Sure, such blue-sky thinking may only seem plausible in the world of Hollywood CGI, but this is the futuristic concept proposed by Japanese construction firm Shimizu Corp.

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