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The blue stabilisers were a component in the TARDIS which stabilised the TARDIS in flight and prevented it from shaking around. The Eleventh Doctor originally believed the blue stabilisers to have no purpose, other than being blue. River Song however, informed the Doctor of their use, and used them to TARDIS stop shaking, the Doctor irritatedly called them "blue boring-ers", and said the journey was no longer fun with them activated. (DW: The Time of Angels) He apparently disabled them soon afterwards, as the TARDIS no longer showed stabilising effects while in flight after this adventure. (DW: Vincent and the Doctor)