“You know, we terraformed Titan,” Louise told Spinner. “There were ships to extract food and air from the seas. You could walk about on the surface in nothing more than a heated suit. We got the atmosphere clear, Spinner-of-Rope. You could see Saturn, and the rings. And the Sun. You knew you weren’t alone down here—that you were part of the System...”
Now, the terraforming had collapsed. Titan had reverted. It was as if humans had never walked Titan’s surface.
“There used to be a city here, Spinner. Port Cassini. Huge, glittering caverns in the ice; igloos on the surface... A hundred thousand people, at least.
-Ring, Ch. 20