Talk:Underground expedition/@comment-26306690-20151204202407/@comment-10733658-20151204205045

Well, at the very least, we know that Eto grew up down there. We aren't sure whether her rampage as the Owl was her first time out in the world, or whether she'd been going outside before then.

But it was definitely her home until her teens, at least. The anime version of things showed her having her own little underground home, but we haven't seen it in the manga. So we really don't know whether it exists in both canons or not.