I used to think that escalators arrived in pieces and had to be assembled on site like some kind of Ikea furniture.
Apparently not. They come in one piece and get hoisted right in there!
Note the featureless rectangular pit that the bottom of the escalator sits in. I’d seen these pits in the remains of the Omni Mall in downtown Miami during a bit of good ol’ urban exploration and wondered what the heck I was looking at. Well now I know, and knowing is half the battle…??