A decommissioned Ringo Heavy Industries foundry complex stretching across six city blocks in the lower industrial belt, its skeletal superstructure of corrugated blast shields and collapsed gantries forming an accidental cathedral of rust and shadow. The central chamber — once a continuous-pour steel hall — now soars forty meters overhead, its ceiling perforated by decades of thermal expansion and scavenging, letting in ragged columns of grey light that shift with the lake weather above. Local residents have claimed the space incrementally, layering shanty platforms along the original mold-track rails and threading illegal power taps through the load-bearing columns.

The Ferrous Nave sits at a functional boundary between Tier 3 residential overflow and the deeper Shelf infrastructure, making it a transit point for people and contraband moving between socioeconomic strata. Ferrogate Security holds a nominal maintenance contract on the outer perimeter but rarely enters the interior, a tacit arrangement that costs the corponation nothing and keeps civil unrest contained. Helix Biosystems operates a discreet tissue-recycling node in the eastern annex, officially licensed for industrial biowaste, though the operation's scope is a subject of persistent local rumor.