“The Plague”, Scenes 6-8: The Commander’s Room, Side 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 c657368e-43e2-4de3-abbd-2489234aa584 (CC0).