We go behind the scenes of this spine-tingling episode and hear why Rose Ayling-Ellis is having 'the best time ever!' Steffan lays camera tracks in a quarry, and we catch up with Ncuti on the beauty of acting using British Sign Language. Subscribe to Doctor Who for more exclusive videos: https://bbc.in/SubscribeToDoctorWho WATCH MORE: Compilations: https://bbc.in/DWCompilations Regenerations: https://bbc.in/DWRegenerations Title Sequences: https://bbc.in/DWTitleSequences New to Who: https://bbc.in/DWNewToWho Official Podcast: https://bbc.in/DWOfficialPodcast MORE ABOUT DOCTOR WHO: Welcome to the Doctor Who Channel! Step inside the TARDIS and embark on an epic journey through time and space. From the Doctor's first adventure in 1963 through countless regenerations, here you will find iconic moments, behind the scenes footage, exclusive content and more! This is the ultimate destination for all things from the Whoniverse. #DoctorWho This is a commercial channel from BBC Studios. Service information and feedback: https://www.bbcstudios.com/contact/contact-us/