“The Bomb”, The Security Kitchen and Corridor Outside

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 146cc302-75ef-484a-b1d9-e329f26d0d12 (CC0).