Insane Ocean Spiral proposed as giant underwater city
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Modern-day Atlantis': Could this huge 'Ocean Spiral' be the underwater city of the future?
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Japanese Design Firm Envisions a Gorgeous, Futuristic Underwater City
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Ocean Spiral: Japanese firm plans underwater city powered by seabed, Japan
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Japanese construction firm says this 'Ocean Spiral' is the underwater city of the future, The Independent
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Insane Ocean Spiral proposed as giant underwater city