TARDIS ancillary power station

From Tardis Wiki, the free Doctor Who reference

The ancillary power station was an engine room in the Doctor's TARDIS.

The Fourth Doctor used the TARDIS art gallery to hide his from Sontarans. (TV: The Invasion of Time)

When the Doctor's TARDIS suffered a power cut, the Fifth Doctor and Nyssa sought out the ancillary power station in order to restore the power. (AUDIO: The Haunting of Thomas Brewster)