I am reading the Bionicle page again and I feel mixed at what I should consider for comparing the movie´s one with The Pit. Technically The Pit fits when it is used as a jail, but the dome shouldn´t have been broken, while the seaquestrian one doesn´t stay drained at all (in theory, for some reason the concept image >>6665 shows that the prison reaches the surface at the top of it) Not to mention that I have read that Fluttershy would manage to escape because of a fish that was passing by, so it´s easier to break jail here while Hydraxon manages to recapture the escapees who fled from the Pit.
I would still claim that The Pit has more similarities with the distant Tartarus than the concepts used for Seaquestria, mostly because of placement (the prison is next to the seapony village). Furthermore, the Pit sounds more severe because it´s the order of Mata Nui who monitors said prison and no way the movie would have made such a huge deal with Seaquestria´s with just Novo alone.
If one had to compare the order, it would match with the monitoring of both Celestia and Luna, therefore, the Tartarus would seem more appropriate here.
