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

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

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OCEAN SPIRAL, Deep Sea Future City Concept, Topics

ocean spiral envisioned as the world's first underwater city

Japanese engineering firm wants to build an underwater city

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OCEAN SPIRAL, Deep Sea Future City Concept, Topics

OCEAN SPIRAL, Deep Sea Future City Concept, Topics

OCEAN SPIRAL, Deep Sea Future City Concept, Topics

Japanese firm proposes undersea city of 5,000 people

Ocean colonization - Wikipedia

Japanese Firm Plans to Build World's First Underwater City