Saba has passed through a few small Wrecker cities at this point, but nothing compares to the monstrosity she now finds herself in. She didn't believe places like this ever existed. Although we don't get the details of the Wreckers' fall from grace, these brief glimpses of the old world reveal a massive conflict between humans and nature.

If there's one thing Saba hates, it's the feeling of constraint. Part of that might be a result of her six-month stint as a cage fighter (talk about confinement), but part of it just goes back to her fundamental explorative nature.

Here's another hint as to what went down with those Wreckers. This passage implies that pollution played a big part in the apocalypse, which certainly would explain the whole "Wrecker" nickname. Y'know—they wrecked the planet.