MarContinuo - Cities Beneath the Roads of Light

"And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great. And the great city was divided into three parts, and the cities of the nations fell. ... And every island fled away, and the mountains were not found." Revelation 16:18-20 KJV

The inhabitants of the double cities lived nearly perfect lives. They neither wondered, nor felt any need to explore their Endless Sea civilization. Occasionally there were indications that the Sea had a life of it's own and, no doubt, surprises, but this couldn't concern them. The Rulers of Light and their complex methods of living simply, kept them content as they planned, not voyages beneath their world, but rather to stars nearby.

With the roads of light the Rulers had also brought methods of traversing the stars, that were based on the quintessence of superstring theory, no longer a theory, but a reality that controlled their lives and futures.

Unknown to the beings of the double city was the nature of the civilizations that existed on the ocean floor. Three major races inhabited those cities. One were oxygen-breathing beings that produced their air synthetically from the water and plants that surrounded their world, within and without the translucent walls of their city.

The second city had beings that lived in structures that were both contained and freely exposed to the forces of water at the planet's floor. They were amphibian beings that were at home, both in and out of air-constrained structures. Their machines generated neutralizing forces that enabled them to withstand the forces at that incredible depth.

The third city's inhabitants were neither one thing nor the other. It was thought they were probably living in cities below the ocean floor and had elaborate portals that enabled them to obtain oxygen from the water which, it was imagined, they also either breathed as true amphibians, or extracted from the life giving water itself.

Those above-ground interracted with each other, and by consent, left the underground dwellers undisturbed, as the last group had never indicated they had a desire or need to contact anyone that might exist above their subterranean world.

After the Million Years ended with the approaching disintegration of this four-tiered world, the beings of each level would need to seek out the others and cooperate to leave their water world in search of a replacement, if possible, or separate on different worlds if such a duplicate planet could not be found.

Only two of MarContinuo's civilizations would leave intact. The other two would survive in some fashion or other. If it was not in a world beyond their own, then it would be in a time far in their own past.