Classroom M-217, as it was officially called, was once one of the five chemistry lab rooms on the main campus of my school, Unity High; I say once because, on record, it was no longer in use, not that it wasn't needed, no on the contrary, with how many portable classrooms there were, alongside the over 7000 student body, every room mattered, however, after working my "Magic" this room fell off the grid, and was now just one of those doors that everyone assumed led to a storage room or something.
What I find funny is the room is actually attached to Mrs.Cargill's room, with a storage room and door separating them.
Mind you, with how much work I've done to M-217, between removing windows, super soundproofing it, and reinforcing the walls, floor, and ceiling to the extent that even if a nuke went off nearby, it would be a bunker, it wasn't like someone could hear or spy on my little, "Activities," and for the entirety of my High School life, this was where I resided.