A bunch of architects want to build a $26 billion underwater city in Tokyo - take a look

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Shimizu Corporation

A rendering of the "Ocean Spiral" by Shimizu Corporation.

Earth as we know it might not last forever.

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If sea level rise triggers flooding in our cities, if climate change makes it impossible to grow food for billions of people, or if there's some other as-yet unthinkable apocalyptic disaster, humans will need a new home.

The architects at Shimizu Corporation, a Tokyo-based firm, want to build underwater cities that they call Ocean Spirals.

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There are no concrete plans to construct an Ocean Spiral, which project leader Masaki Takeuch estimates would cost $26 billion. But the renderings are certainly fantastical.

Check them out below.

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