“The Plague”, Scenes 20-24: 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 56fd69f4-6e5a-458e-b747-84f410e29e53 (CC0).