| ||For the character, see Ghoul undergrounder.|
We're hiding here; please don't tell anyone where we are.”— Ghoul undergrounder
Presumably due to their unwillingness to partake in his hostile administration of the City of the Dead, they were forced by Set to live in the city's sewers. They were apparently unarmed and form no threat to anyone, but were one of the most helpful factions in Necropolis, telling the Vault Dweller where to find the water chip but requesting him to fix the pump first.
The underground ghouls only appear in Fallout.