Reopen the other door

You move over to the door that the drider exited through, trying its handle tentatively. The knob turns easily in your hand, and as you pull, the door starts to slide open with its distinct grinding noise, but you catch it after it moves no more than an inch and let the door close again. As soon as it slides back into place in the frame, you hear the same clicking sound come from the door next to it.

You quickly move over to the other door, trying the knob again. Unsurprisingly, the door slowly swings open, still with the same loud sound of metal scraping against stone.

The room beyond appears to be some sort of medical facility, with medical tables strewn about among operating equipment, bags of fluid, and other unidentifiable machines. Outside of the sounds from your entrance, the halls are completely silent, and the sound of your footsteps echo through the room. It's large and circular, almost as if it's an entrance hall. There are three hallways leading off of the room, each at a 90º angle from the door you've entered through. Each hallway has a word written above it, likely describing it's location. Directly ahead leads to the Supervisor's Office, the left hallway goes to operating rooms, and the right hall is labeled simply "Experimentation."

A large desk is directly in front of you, rectangular and unattended. One machine in particular sticks out- it's bigger than your body, made mostly of metal, and tucked away in a corner nearby, between the door you exited and the operating rooms. Opposite of the machine, there's a small patch of green where foliage has broken into the facility, complete with a small pool of water.