The Japanese construction company Shimizu Corp announced a $25-$26 billion underwater eco-city plan called “Ocean Spiral” of 5,000 people that draws its energy from the seabed thousands of metres below.

Shimizu Corp revealed a blueprint for the city of the future in Tokyo last week, claiming that Ocean Spiral will “capitalise on the infinite possibilities of the deep sea” to accommodate human life, as rising sea levels endanger the survival of island communities.

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