“The Plague”, Scenes 18-19: Main Deck and Side Room

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 c293825a-44e2-402d-8495-14a7c9d9125e (CC0).