Nel nodded, smiling softly as she looked into her cup. "It takes some getting used to," she admitted. "It was different when we first got here, but it's a bit more populated now." That wasn't always a good thing, especially given some of the inhabitants, but it made the place less samey. "And we have the garden now," she added.

They hadn't found that when Nel and most of the Arrancar had arrived. It had just been the deep darkness of underground beyond windows. No one had tried going out because you didn't know what you were going outside to, or that there was an outside.

And then Aizen had found the weather machine in the training facility, and the world outside the windows had lit up. The place had started to seem less oppressive and gloomy then. "Marluxia installed most of it from scratch, but he keeps the dangerous things to the corner with the greenhouse."

Because his alternative was going through a lot of Malboros very quickly.