River Rouge is where steel was born and where it refuses to die. The downriver industrial zone — centered on the city of River Rouge and extending through Ecorse, Lincoln Park, and the southern reaches of the Detroit metro — has been making steel, processing metals, and turning raw materials into the skeleton of civilization for over a century. The Great Lakes Steel Works, originally built in 1929, was acquired by Ashgrave Materials in 2148 and rebuilt into the Ashgrave Great Lakes Crucible — a next-generation metallurgical facility that produces the specialized alloys, composite metals, and structural materials that autonomous vehicle frames, arcology towers, and military hardware require. The facility employs 12,000 workers and operates around the clock, its electric arc furnaces visible from five miles away as a constant orange glow on the southern horizon.

The community that surrounds the Crucible is blue-collar in a way that the 22nd century tried to eliminate and couldn't. These are people who work with metal — not the clean metal of augment technicians but the raw metal of furnaces and rolling mills and forging presses. The work is hot, dangerous, and augment-intensive — the Crucible's workers use industrial-grade exoskeletons, thermal-resistant augments, and neural interfaces calibrated for metallurgical process control rather than communication or entertainment. The augments are functional, scarred, and maintained by the workers themselves because Ashgrave's corporate maintenance schedule prioritizes production equipment over human equipment. A Crucible worker's augments tell their work history the way a sailor's tattoos used to.

The district's identity is inseparable from the work. The bars serve shift-change schedules. The housing was built within walking distance of the gates. The community organizations — the Steelworkers' Mutual Aid, the River Rouge Athletic Club, the downriver food cooperatives — all exist to sustain a workforce, not a population. The distinction matters: the Crucible treats its workers as a resource, and the community has adapted to sustain that resource, and the question of whether the people are serving the steel or the steel is serving the people was settled a long time ago. The steel won.