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| “ | If you are a non-employee who has discovered this facility amid the ruins of civilization, welcome! And remember: Testing is the future, and the future starts with you.
— The Announcer
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The Announcer plays a small part in Portal 2. He guides the player with pre-recorded messages through the facility early on in the game before initiating the first stalemate between GLaDOS and Wheatley.
Most likely it is is an automated system created to monitor the Aperture lab complex prior GLaDOS, and lately left as a backup system to keep research going even during "circumstances of potentially apocalyptic significance". Designed to work in extreme and low power conditions, the system seems to have been automatically turned on as soon as GLaDOS was destroyed and lost control of the facility.