Bellows

According to one account, the Doctor's TARDIS's iconic wheezing, groaning sound was produced by a huge bellows emblazoned BBC Sound Effect located in a room inside the TARDIS, and which was worked by Quinn and Howett. (NOTVALID: Outta Space) In other accounts, however, the sound was the result of the Doctor always mistakenly leaving the brakes on during take-off. (TV: The Husbands of River Song)