Black Archive

The Black Archive was a secret vault maintained by UNIT.

Function
It functioned as a depository of everything that shouldn't exist on Earth but did anyway, and required a UNIT level one clearance to gain entrance. (TV: Enemy of the Bane) The staff had their memories erased after every shift. (TV: The Day of the Doctor)

History
The Doctor, during either his second or third incarnation, aided in the foundation of the Black Archive. (COMIC: Don't Step on the Grass)

On 4 June 1972, UNIT bought the Tunguska Scroll from a private collector and placed it in the Black Archive. In 2009, Brigadier Lethbridge-Stewart smuggled Sarah Jane Smith into the archives to steal the scroll. (TV: Enemy of the Bane) During the same year, the Tenth Doctor sent Martha Jones there to fetch information on the Krynoid virus in the hopes that it might hold a key to stopping the Enochian invasion in Greenwich Park. (COMIC: Don't Step on the Grass)

In the 21st century, a vortex manipulator had been donated there by Captain Jack Harkness. Kate Stewart entered with Clara to show it. However, it tuned out that it was not Kate Stewart, but actually a Zygon duplicate of Kate, and the Zygons had infiltrated the base. Clara then used the manipulator to travel to 1562. The Zygons then had free reign of the base, believing with the amount of alien technology there that they could overrun the Earth easily. The genuine Kate Stewart then turned up, and activated the nuclear armed self-destruction mechanism the base had. The Zygon who was imitating Kate was able to shut it off due to it being voice responsive to her voice, but the real Kate could also countermand it, resulting in a deadlock between the two. Eventually the Eleventh, the Tenth, and the War Doctor turned up to stop her. They activated the memory erasing equipment in the ceiling, meaning the two sets of people forgot that they were human and Zygon, and stopped the self-destruction mechanism, saving themselves and the whole of London, resulting in peace talks between the humans and the Zygons. (TV: The Day of the Doctor)