That's...a long story. Mosley-san pushed us down there. Or, some that I found after I fell down. There was a group of us and we tried to make our way back up. We did, but only after finding some robot dinosaurs and one of us dying fighting them off.....

[And the cage.]

At the end, we got to ask a question, each of us. I think the others probably got better answers - I just wanted to be sure that the one who died, that they would be okay and come back. [She still isn't entirely sure how it works, something with the code. But either way. Reincarnation is hardly new to her, after her memories as Princess Serenity returned.]