GM UPDATE POST
The door seemed to vibrate a bit for a long time... Both were patient. Eventually, it slid open and revealed the small sick bay, home of Dr. Laszlo Martin's future office... Stuff seemed to have been stirred. There were empty wrappers for various medical equipment on the floor and a trash bin full of them. A diagnostic bed was in full sight. A cool blue light bathed the area. It was a smooth comforting light, but also felt a bit claustrophobic for now. At the end of the room was the emergency pod to go upstairs. Basically a ladder inside a small tube barely large enough for one person at a time. Its functioning was simple, a person entered the tube with the ladder. Atmosphere was pumped in, and the hatch to the upper level would open once that was done. It also worked in reverse, a person could come from an atmosphere section, close the hatch, then a vacuum was created inside and the door would open into the vacuum environment.
EDIT: Of course this emergency ladder goes upstairs in the control room.