St Luke’s University
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A secret vault, containing an imprisoned entity, was hidden beneath the campus of St Luke’s University in Bristol which the Twelfth Doctor made a promise to protect.
The Doctor and Bill Potts were chased to the location of the vault by a puddle of sentient oil which had taken on the image of a former studentat this time, both The Doctor and Nardole only left their posts when they realised that the threat was after them and showed no interest in the contents of the vault. (The Pilot)
After being told by The Doctor to “leave [him] alone”, a frustrated Nardole voiced his frustrations to himself while standing guard at the Vault before being interrupted as the prisoner started heavily knocking the door. Though acknowledging that The Doctor had been “distracted” by Bill, Nardole, hiding his fear, asserted to the prisoner behind the door that he would still stand guard and would not let it escape. ( Thin Ice)