The '''Cloister Bell''' was an alarm bell located in the [[Cloister Room]] inside [[TARDIS]]es.{{fact}}
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The Cloister Bell was used in the most serious of emergencies, which saw e
* The sound of the Cloister Bell was made by hitting a gong in a pool of water. {{fact}}
* The Bell was not heard on-screen until towards the end of the Fourth Doctor's life and was not heard during other incidents of danger during the following episodes:
** The looped death of the TARDIS ([[TV]]: ''[[The Pandorica Opens (TV story)|The Pandorica Opens]]'' / ''[[The Big Bang (TV story)|The Big Bang]]'') and the activation of the [[HADS]] when the TARDIS felt it was under attack. ([[TV]]: ''[[Cold War (TV story)|Cold War]]'')
