There are many stairways designed to afford the user every opportunity to make an elegant entrance. This isn't one of them. Rickety, twisted, missing crucial flagstones and with only an occasional segment of crumbling balustrade, someone might as well have gone the whole way, and just inscribed over the entrance arch, "Abandon all hope, ye who enter here".
Beyond this staircase, it is clear, lie things you'd rather not have to write a report about. Not merely a dungeon, then, perchance a full-scale oubliette.