Ocean Spiral is a conceptual city proposed beneath the surface of the ocean

Insane Ocean Spiral proposed as giant underwater city

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Ocean Spiral is a conceptual city proposed beneath the surface, This environmentally friendly underwater city could be a reality by 2030. By Dezeen

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

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

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Ocean Spiral' proposed as giant underwater city