Location from Foundation by Isaac Asimov
Working-class sector of Trantor — heat sinks, knife-fighters, and the rough edge of the world-city where Raych grew up and Seldon learned that Trantor's underclass had its own kind of strength.
Dahl is where Trantor drops its mask. The upper sectors maintain the fiction of Imperial grandeur; Dahl admits that a world-city of forty billion requires a vast working class to maintain the heat sinks, sewage systems, and infrastructure that keeps everyone else alive. Dahllites know their sector is looked down upon and respond with aggressive pride — the knife-fighting culture isn't just tradition, it's identity. Seldon landed in Dahl during his flight across Trantor and found something psychohistory's equations hadn't prepared him for: people whose survival instincts were sharper than any academic's theoretical framework. Raych — the street kid who became Seldon's adopted son — embodied Dahl's particular genius: adaptability, loyalty, and a knife that came out fast when needed. Dahl's heat-sink workers are essential and know it. When they strike, Trantor's thermal management fails within days. This gives the sector political leverage that its social status wouldn't suggest — another lesson in the gap between how power looks and how it works.
A lower-level sector where the ceilings are low and the light is artificial and yellowish. The corridors are narrower than in upper sectors, the walls showing exposed infrastructure — pipes, conduits, ventilation ducts. Heat from the planetary heat sinks makes the air perpetually warm and slightly humid. The residential areas are dense and vertical, stacked apartments connected by metal staircases and catwalks. Public spaces are functional: markets, fighting arenas, transit hubs. No parks, no decorative architecture, no pretense.
Also known as: Dahl Sector, the Dahlite Sector