Swaying gently in her chamber, the mechanical lady felt a sudden twitch in her spine. Connected to the whole facility, she could feel every bit of movement in every area of space, like back spasms every waking moment. But this particular feeling was different, for she could feel running. She could feel tiny feet, running along tiny runways and tiny platforms. Something was here. And it couldn't have been that lunatic. She was probably long gone by now. No, this was something different. Maybe the testing robots had been deployed by accident, but upon scanning the testing environments, there was nothing, and the elevators were completely still.
"What's going on?" she asked herself, flicking through the cameras. She had been working her way down the new, forgotten test shafts, thanks to the new testing robots doing things she physically couldn't from her chamber. Perhaps one of these areas had been unlocked. Then finally, it hit her: the human vault had opened.
The Aperture Science Extended Relaxation Annex (known to GLaDOS as the "human vault") was a large containment vault housing hundreds of humans from the vintage era, forgotten in time. The robots had found this vault, but GLaDOS had put off opening it until she had built enough test chambers. After all, the chaos she endured when one human was in the facility was enough without hundreds present. This was, in truth, a nightmare, but she had prepared for a situation like this.
"Well, this should be fun," she whispered, thinking about all the things she could do to stop these humans from ever reaching the surface. The turrets were on their way, the gas was warming up, and it was time to test.