Welcome to Call of Duty Answers Wiki. What would you like to know?

All depends on what you mean. If you mean that if you kill the people then you press the red button, nothing will happen. If you mean that you press the button then kill everyone and want to know how to get them back, all you have to do is move halfway down the hallway and go back and all the character should have respawned, if not, you didn't go down far enough.

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