Slated to cost over $25 billion and take 5 years to complete, this incredible proposal starts a with a living sphere that spans over 1,500 feet below the surface of the ocean.

Designed by the Shimizu Corp’s, the spherical portion of the so-called Ocean Spiral forms a residential and commercial core from which a winding path spirals 9 further miles into the deep, ultimately terminating at the ocean floor.

Occupants would live and work both in triangular neighborhoods along the periphery as well as within a tapering, hourglass-shaped, skyscraper-like segment stretching up from the bottom to the top of the sphere’s center.

The ‘Earth Factory’ portion of the project below is set to use generate eco-friendly energy from temperature differentials and organically-driven chemical conversion processes.

For anyone wondering just when they can expect this marvel to materialize: its would-be creators concede the technology is not quite in place yet to make it a reality, but hope and presume it will be soon.