What happens if you choose GLaDOS' way in Portal 2?

Spoiler warning!

During the first escape attempt in Portal 2 (when GLaDOS is still in charge) she opens a door for you which you can choose to go through instead of following Wheatley (the blue-eyed ball). What happens if you go there?

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1 Answer

GLaDOS closes the door and the wall. Then she fills the room with a deadly neurotoxin and you die.

Here's a video showing that scene:

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