Emergency Program One

The Emergency Programme One was a feature of the TARDIS designed to return to a designated place home in case of extreme emergency (DW: The Parting of the Ways)

The Doctor mentioned that Emergency Programme One was automatically activated after five hours. (DW: Silence in the Library) When activated, it created a hologram projection recording which explained the programme. (DW: The Parting of the Ways)

Uses

 * Believing that he would die on the Game Station, the Doctor used it to record a message for the benefit of Rose Tyler before the TARDIS returned itself and Rose to her home of Powell Estate in 2006. (DW: The Parting of the Ways)
 * Donna Noble recorded a message on it as a way to say good-bye to the Doctor, in the event that she might not have a chance to do so herself. (DWM: The Time of My Life)