“The Plague”, Scenes 25-27: The Commander’s Room and Main Deck

On these albums

Doctor Who: The ArkPaul Erickson and Lesley Scott starring William Hartnell, Jackie Lane & Peter Purves · 2006Soundtrack

Doctor Who: The TV Episodes - Collection SixVarious Artists · 2013

Source: MusicBrainz recording 6894ba0e-b4cd-41a3-b509-ed6f62ba0e99 (CC0).