The Vault (Tales from the Vault)

The Vault was a location where UNIT kept various alien artefacts, as well as records of their capture. Both Captain Ruth Matheson and Charlie Sato worked there. The Vault was permanently kept dark, as some objects would react with light. It was known to contain a deactivated Terravore, Krynoid pods, possibly the wreckage from a Sontaran scout ship, an army jacket, a painting, crystal and a wax cylinder. (AUDIO: Tales from the Vault)

The Vault was also where the Master was imprisoned when he was captured by UNIT following his escape from the Eye of Harmony (AUDIO: Mastermind).