When Sally heads up these stairs she'll wait for you at the top. You'll want to search the shelves and table tops here before following her up the stairs.

When you meet Sally at the top of the stairs, she'll tell you she has found something special. Sally will ask you to follow her.

Sally moves fast, so keep an eye for where she goes. This time she is just heading around to the left. You might not be able to see her at first due to the obstructed view. Just head around.

When you approach Sally at her great discovery, she'll tell you that apparently the aliens have turned off the elevator. Then she'll tell you that she's found something else. Sally will go running off again after that.

Don't panic if you lose sight of Sally. She has gone through a door on the far side of the level you are on. Simply head on over and through the door.

When you catch up to Sally again just talk to her. She'll explain that you need a spacesuit to go outside. Once you've finished talking to her you'll get the quest complete notification.