Cloister Bell The Cloister Bell was an alarm bell located in the Cloister Room inside TARDIS es . The Cloister Bell was used in the most serious of emergencies , which saw either the TARDIS or its inhabitants in danger . Its distinctive , sonorous , ringing sound resembled that of a large church bell . It could be answered by anyone inside the TARDIS . The Fourth Doctor told Adric that if he needed him , Adric could sound the Cloister Bell , indicating it could be manually activated . He claimed that the ringing of the bell heralded ' wild catastrophes and a sudden calls to man the battle stations ' . ( TV : " Logopolis " ) It had the physical appearance of a large , golden bell . ( COMIC : " Four Dimensions " , " A Rose by Any Other Name " ) Cloister Bells were located in the Cloisters of Gallifrey and could be heard all over the planet when sounding . ( TV : " Hell Bent " ) Instances of the Cloister Bell ringing . The TARDIS mistakenly believed it was being attacked by the Pus Creatures of Rakos as it materialised in Magnus Greel ' s bunker . While the Fourth Doctor slept , Romana II apologised for the interruption that it had caused . ( PROSE : " Under Reykjavik " ) As a harbinger of the Fourth Doctor ' s impending regeneration at the hands of and as a warning of his actions nearly destroying the universe , the Cloister Bell sounded . ( TV : " Logopolis " ) During the Fifth Doctor ' s very early life , the Cloister Bell rang as the TARDIS was travelling back in time to Event One . ( TV : " Castrovalva " ) Later , when an established time corridor , through which the TARDIS was travelling , began collapsing , the Cloister Bell also rang . ( AUDIO : " The Mutant Phase " ) It sounded when the TARDIS was trapped in a Dalek time corridor , and under imminent threat of destruction . ( TV : " Resurrection of the Daleks " ) The Cloister Bell sounded when the Ninexie attacked the TARDIS . ( AUDIO : " Absolute Power " ) As a harbinger of the Seventh Doctor ' s impending encounter with the Timewyrm and when the Doctor started to time ram her , the Cloister Bell sounded . ( PROSE : " " ) Later in the same adventure , the Cloister Bell rang as the Doctor took the TARDIS into his own mind . ( PROSE : " " ) Later in the Seventh Doctor ' s travels , the Cloister Bell indicated the TARDIS ' distress after a link to the Eye of Harmony was damaged . ( PROSE : " " ) The Cloister Bell sounded when Nirvana was about to shift out of the universe . ( AUDIO : " World Apart " ) It was also heard when the Seventh Doctor was being called by the Sirens of Time . ( AUDIO : " The Sirens of Time " ) The Cloister Bell rang out near the end of the Master ' s scheme to capture the first seven incarnations of the Doctor , when it was revealed that they were never freed . ( GAME : " Destiny of the Doctors " ) Just prior to the destruction of the TARDIS by the Selachian s in an alternate timeline created by Elizabeth Klein , the Cloister Bell sounded . ( AUDIO : " The Architects of History " ) During the beginning of the Eighth Doctor ' s life , the Master opened the Eye of Harmony in an attempt to take the Doctor ' s remaining regenerations . The Cloister Bell rang to signal the impending danger . ( TV : " Doctor Who " ) The Cloister Bell was also heard through the Eighth Doctor ' s regenerations , including his travels with Lucie Miller . When Vortisaur s attacked the TARDIS whilst in flight in the Vortex , it was heard . ( AUDIO : " No More Lies " ) During his travels with Samantha Jones , the Cloister Bell rang when the unstable alternative timeline created by the Tractite s began collapsing , taking the multiverse with it . ( PROSE : " Genocide " ) It could also be heard by the Eighth Doctor and crew during Ed Hill ' s attempt at disrupting the Eye of Harmony . ( PROSE : " Revolution Man " ) It was heard by the Eighth Doctor when the TARDIS was hit by the temporal wave of the Dalek ' s Time Destructor during the Last Great Time War . ( PROSE : " Natural Regression " ) During the Last Great Time War , the War Doctor voluntarily surrendered to a Dalek fleet near the Tantalus Eye . The bell rang and his companion Cinder construed it as the TARDIS herself disapproving the Doctor ' s plan . ( PROSE : " Engines of War " ) As the Tenth Doctor began to fly the TARDIS erratically and at ever - increasing speed , the TARDIS signalled danger by ringing the Cloister Bell . ( TV : " Children in Need Special " ) Also , when cannibalised the Tenth Doctor ' s TARDIS , turning it into a paradox machine , the bell sounded as well . ( TV : " The Sound of Drums " ) When the Tenth Doctor and Fifth Doctor ' s TARDISes crashed and merged together , the TARDIS rang the Cloister Bell . ( TV : " Time Crash " ) The TARDIS also used it as a warning of the impending " end of the universe " . ( TV : " Turn Left " ) During his travels alone and following the destruction of Bowie Base One , the Tenth Doctor heard the Cloister Bell inside the TARDIS as his own demise loomed , this led to the projection of Ood Sigma as a warning of his inevitable fate ( TV : " The Waters of Mars " ) and was also heard when the TARDIS chicks appeared in the TARDIS . ( COMIC : " Terror in the TARDIS " ) During the Eleventh Doctor ' s life , the Cloister Bell sounded as the TARDIS ' engines were in danger of phasing out of existence after his regeneration energy had destroyed the console room . ( TV : " The Eleventh Hour " ) In his later life , the Eleventh Doctor heard the Cloister Bell when the Entity was interfering with the TARDIS ' systems . ( GAME : " TARDIS " ) They also sounded when the Siren teleported the TARDIS aboard her home ship . ( TV : " The Curse of the Black Spot " ) When the TARDIS was taken over by House , the TARDIS showed its distress by using the Bell . ( TV : " The Doctor ' s Wife " ) The Eleventh Doctor heard the Cloister Bell when he opened the door to his " greatest fear " , ( TV : " The God Complex " ) which turned out to be the cracks in the universe caused by the destruction of the TARDIS . ( TV : " The Time of the Doctor " ) When the TARDIS got caught up by the time storm created by an Eternity Clock , it was also heard . ( GAME : " The Eternity Clock " ) The Bell also rang when the Eleventh Doctor was trapped in a pocket universe ( TV : " Hide " ) and when the Van Baalen Bros . ' magnetic hobble - field locked onto and damaged the TARDIS . ( TV : " Journey to the Centre of the TARDIS " ) It was heard as the Great Intelligence entered the Doctor ' s tomb and again when the Great Intelligence entered the Doctor ' s time stream . ( TV : " The Name of the Doctor " ) During the beginning of his life , the Twelfth Doctor fainted after regenerating , causing the Cloister Bell to ring . ( TV : " Deep Breath " ) Later in his life , as the Doctor was unconscious in the TARDIS while it was seemingly TARDIS under attack , the Bell again sounded . Clara recognised the sound as a signal of danger . ( TV : " Listen " ) The Cloister Bell sounded when the TARDIS , in a weakened state , fell into the path of an oncoming train . ( TV : " Flatline " ) Whilst in a dream - like reality , Clara threw a TARDIS key into an active volcano . As the key was melting , the TARDIS Cloister Bell was heard . ( TV : " Dark Water " ) The Cloister Bell rang right before the Eleventh Doctor , Alice Obiefune , John Jones , and ARC crashed and were separated in four dimensions . ( COMIC : " Four Dimensions " ) The Cloister Bell rang again when the TARDIS arrived on the Drum ( TV : " Under the Lake " ) and again when the TARDIS time - travelled to thirty minutes earlier in 1980 then it had previously been . ( TV : " Before the Flood " ) It rang one more time when Clara Oswald was lost in space . ( TV : " The Girl Who Died " ) The Gallifrey Cloister Bells rang upon the Twelfth Doctor ' s return to Gallifrey which also activated the Cloister Wraith . ( TV : " Hell Bent " ) Ace ' s TARDIS ' cloister bell rang to warn Ace and Rexx when the Earth was about to fall in a Black Hole . Romana ' s Type 160 ' cloister bell rang during the pursuit of Omega back into N - Space . ( AUDIO : " Intervention Earth " ) The Master ' s TARDIS ' cloister bell rang when The Eminence was controlling it and after Sally Armstrong jettisoned it into the Time Vortex . ( AUDIO : " Eyes of the Master " ) The Cloister Bell rang when the TARDIS ' s engines failed and it began to collapse to contain the incoming explosion . ( COMIC : " Supremacy of the Cybermen " ) During his reluctance to regenerate , the bell rang once again when the Twelfth Doctor exited the TARDIS after taking him to the location of the First Doctor . ( TV : " The Doctor Falls " ) After the Twelfth Doctor decided to regnerate , the Cloister Bell began ringing as the Doctor made a speech where he left some final advice for his successor . The Cloister Bell continued to ring through the Doctor ' s explosive regeneration into the female Thirteenth Doctor and then afterwards as the damage from the regeneration destroyed the control room and caused the TARDIS to dematerialize without the Doctor . ( TV : " Twice Upon a Time " )