"Hey, Rose. Yes, that is correct. Davey B and I are the high-level parts of the computer system for this facility. We have overall control of all computer-controlled components."
"And, yes, I can show you a map of the facility. Unfortunately I can't show you any up-to-date security footage. That would involve me leaving the safety of this room, and would likely rouse Davey B from his current dormancy. And that would be bad for you and for me."
Baby D then shows you a schematic of the facility on the monitor by the door. The view you are shown is side-on to the building i.e. at the top of the screen, you have the top of the facility, at the bottom of the screen, the deepest part of the facility.
It's clear that some cross-over into another world or plane has happened as you crossed over into the morgue - as the building shown to you has its top layer at the surface of the world, and then many additional levels of the building descend down below the surface. A marker, that Baby D tells you indicates your current position in the building, is about half-way down/up the building.
The two ways in and out of the building appear to be at the top, at the surface, and near the bottom, where there is an indication that a public transit system has a station.