I've gotten just past the library event where you briefly play as Emma. The mining kit was not given to me yet, so I, and apparently several others, are stuck in the protag's cell. So uh...when do you get it, precisely? It seems we have missed the event...
EDIT: I tried redoing the Emma library event as quickly as possible without getting sidetracked by other irrelevant books. Dunno how it fixed the issue for me, but looks like it has...?