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Vibe's Atlas Chambers 1:The Part Where You Fall.

LORE (oh boy)
This takes place in a timeline where Chell is dead, and Wheatley has managed to keep Aperture Science from exploding into pieces.

Atlas is an old robot made for testing, discovered by Wheatley. He was activated, but instead of going on the new testing tracks, he was put onto his original tracks, which.. aren't in the best state.