1 ene 1986 año - Aperture Science find out Black Mesa is working on similar portal technology. (ApertureScience.com)

Descripción:

- 1986
- The Conversion Gel Testing Facility is updated with an additional wall.
- Word reaches Aperture Science management that Black Mesa is working on a similar portal technology. In response to this news, Aperture Science begins developing GLaDOS, although the name was already in use in 1982.

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