Amethyst Viral Containment Station
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Amethyst Viral Containment Station was a depository for dangerous viruses used in the Viyran's war. It was a maximum security facility. The Station is near the core of a planet orbiting Amethustra, at the universe's edge. The Doctor says it is "one of the remotest periods of space-time the old girl's ever travelled in". (AUDIO: Patient Zero)