Eternal War

The Underground and the Aboveground have been in some sort of civil dispute colloquially known as the “Eternal War” as they have basically been fighting ever since the colony arrived on Mars.

History
The residents of the Aboveground were clearly “better” than the Underground residents in every way. They were more famous, smarter, kinder, had more money, everything that the Underground could’ve ever wanted the Aboveground had. The Underground was done with this and a resident of the Underground began killing some of the Aboveground residents out of spite. For some reason, he was able to get out of all charges. This spawned multiple other people to do the same thing. Civil, in this case, does not mean it was nice.