Violet Plateau

The Violet Plateau was a natural formation which housed underground laboratories for scientific experiments by the Keen. The Violet Archives were in or around the Violet Plateau, and held records of its experiments.

Experiments
Weapons research occurred at the Violet Plateau. One weapons blueprint showed a focal device that concentrated the wearer's psychic energies into a blast of piercing energy. Some believe blueprints such as this are better off remaining lost.

The Violet Plateau Incident
The research team, including Boush, accidentally tore open a portal to a different world, causing alien creatures to enter into this world. The Violet Plateau was eventually destroyed by this event, with Boush being the final survivor.

Lanaya visited its ruins later on, memorizing what remained of its records in the archives.

Trivia

 * The Violet Plateau is based on the Black Mesa, a location where similar events occurred in Half-Life, another Valve title.