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Ocean Spiral: Japanese firm plans underwater city powered by seabed, Japan

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Japan's $28 Billions Underwater City - Ocean Spiral City

5 incredible concept designs of future cities that seem out of this world – New York Daily News

Spiralling underwater cities could descend to the ocean floor by 2030

Spiralling underwater cities could descend to the ocean floor by 2030

Ocean Spiral is a concept for a city beneath the surface of the ocean

Ocean Spiral: Japanese firm plans underwater city powered by seabed

Ocean Spiral' proposed as giant underwater city

5 Architectural Visions for the Future of Tokyo

Plans for underwater city revealed by Japanese developers - YBW