I'm looking for the title of a children's (or young adults) book that I read in the UK in the late 1980s or early 1990s about a group of people that live underground in a multilevel complex where different levels have different social standings.
The protagonist characters eventually escape up to a post apocalyptic surface and fight the surface dwellers with a laser gun.
Any help would be much appreciated 👍.
Thanks.
by Kraiklyn1976