Under the Lake (in-universe)
From Tardis Wiki, the free Doctor Who reference
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Under the Lake was the third episode of the ninth series of Doctor Who. It followed a The Witch's Familiar and was succeeded by Before the Flood.
It featured the Doctor and Clara and its synopsis mentioned the duo trying to give their help on an "underwater base". By 10 May 2020, the episode was available on BBC iPlayer along with the rest of series 9. (WC: The Zygon Isolation)
