Test Subject Containment Zone

The Test Subject area is the largest spawn zone in the facility. It serves to hold the Test Subjects, containing a generator room connected to it via a vent, some solitary confinement cells, and a cafeteria all in one place.

If they screw up, they get sent into solitary confinement (at least you're safe from a breach).

Test Subject cafeteria
The test subject cafeteria is a room connected to the spawn, and contains two tables, a Thief Cola machine, a coffee maker, a pile of donuts, and an area behind it that regardless of what keycard you use, cannot be opened, which has a vent you can use to get in.

Solitary confinement
Solitary confinement is a special area behind the red line that has 3 extremely cramped cells. The cells are meant for extremely dangerous and hostile test subjects.

Prior to May 24/26, 2021, test subjects were able to access it, but after the updates, test subjects can no longer access it with either a Prisoner, Level 0, or Level 1 keycard.

Exercise room
In very early versions of the game, there was an exercise room connected to the Test Subject Area. The room had a green floor with a carpet-like texture, and there were also jogging mats and bench presses. The area was later removed in favor of the generator room.