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Security Protocol 712 was a security feature aboard the Doctor's TARDIS which would cause the ship to dematerialise and re-appear at a predetermined point in space and time without its pilot when activated. It could be programmed to be triggered by different events or objects such as Sally Sparrow's DVDs (TV: Blink) or the activation of the echelon circuit. (TV: Before the Flood) A holographic recreation of the incumbent Doctor would generally be projected to inform anyone within the TARDIS of the protocol being activated.

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