[A/N]

This is where the ChellDOS part really comes to a start. Even though this is the tenth chapter, I feel like the story's moving a tad too fast. I don't know, maybe it's just me. Reviews are highly appreciated. Enjoy!

She ducked under the closing door, and stepped to the other side. She couldn't see much of anything, and her only source of light was slowly getting blocked off by the shutter. When the shutter almost reached the ground, lights came on, one by one.

Clank. Clank. Clank.

She could now see the garage she was standing in. It looked just like your standard employee garage, except for the elevator on the other end of the room.

In almost every parking space, a car could be seen. Makes sense for a company this size, she mused. The cars were a bit on the old side, but looked untouched nonetheless.

She felt her heart rate increase. The effects of the adrenal vapour started to kick in again.

"Welcome back." GLaDOS' voice sounded. "The lift will take you to the Central AI chamber." Unlike in the test chambers, her voice seemed to come only from small speakers in the ceiling, making her voice slightly muffled.

The test subject's face conveyed her thoughts well. Something along the lines of 'Yeah right'.

"I'm not kidding here." If GLaDOS had arms, she'd have held them up. "What makes you think that after all you have done to my facility, I'd make the mistake of testing you again?"

She did have a point.

Still slightly wary, she stepped into the elevator, which closed right away.

What are you doing? Get out of here! A voice in the back of her head said. It's not too late! She doesn't need you per se! You can still leave! She simply ignored it.

In order to remain, well, sane, she knew she had to retain social contact, which is hard to do when your species has died out completely. It wasn't, however, impossible, as proven true by Aperture's greatest AI.

She didn't try to kill you before, she merely let you go. Why would she kill you know? Chell thought to herself.

As the lift descended, the Central AI Chamber came into view, and thus the AI herself.

It reached the floor, and opened. As soon as she stepped out, the lift sunk back into the floor.

"Hello again."

The girl waved casually, and sat down onto the floor. She was surprised to see a panel flip up underneath her, serving as a makeshift chair.

"First of all, I hope you don't expect to stay here for free."

She nodded.

"We'll need to figure something out for you to do. Let's see…"

The sound of someone flipping the pages of a book could be heard over the speakers.

"Honestly, there's not much you could do apart from testing, and we all know how much you love that.", she said sarcastically.

More page flipping sounds.

"However…"

The girl piped up.

"There are a lot of scientific documents down in old Aperture I'd like to retrieve."

Chell crossed her arms. She was not going back down there.

"As we both know, going down there is not easy."

She nodded fiercely.

"That's why I'm going to make it easier for you."

Thank god, she thought.

A couple of panels in the wall behind her moved out of the way, revealing a Portal Gun resting on a pedestal, with an unopened orange portal behind it.

"What you are looking at, is a one-way portal device. Once you have reached the designated area, open a blue portal on a nearby portal-accepting surface."

She gave the supercomputer a confused look. How am I even going to get there without using portals?

"In my time as a potato, thanks for that, by the way, I had the opportunity to inspect the pipes running through old Aperture. One of these tubes will lead you directly to the library. Good luck."

She was both surprised and scared when the panel she was sitting on flung her backwards. She yelped as she was unceremoniously dropped into the pit that lead to old Aperture.

Her long fall boots quickly worked her upright. She took a glance down, and, just like the first time, there wasn't an end in sight. Her gaze shot back up, and saw as her portal device was falling just above her.

She grabbed it from above her head, revealing yet another object falling at terminal velocity, fifteen feet above her.

Her eyes widened as she saw what it was.

The object hovering above her, was a bomb.