"The ants were here before us," Korra said, though she looked a little contemplative now. "I guess they were living in a different part of the tree.

"And that's the thing. If there were people here before us, that means some of the floors were sealed up after they left." She paused; the next thought wasn't one that she liked. "This place was too clean when we got here. If anyone lived here, something must have made them pack up and leave."