How to get to the Pit from the Stage at the Auditorium

How to get to the Pit in the Auditorium Theater in Chicago.
Detailed instructions and directions!
Incidentally, the music that's playing is the actual music coming from the pit while I filmed. It's Offenbach in the Underworld.

But honestly, look, I don't know if you've ever been to the Auditorium Theater, or if you've ever been to any theater in your life, much less spent any time actually backstage. But if you have, you might appreciate how ridiculous the situation illustrated in this little film is. I mean,come on, architects! you have to navigate thru 5 of a possible 8 nearly identical doors, and thru a series of 4, count-em 4, vestibules of nothing but access to other doors. You think it's tedious to watch... what if you had to actually work there? Like some of us do?

I know, this is a really silly thing to be griping about. But whatever. Here it is.