The unpolished lower city. Part 1 puts Mekhi's workspace in a Near-South sublevel and shows older infrastructure under the 'civic skin'. In Part 2 R.S. and Renee descend by a vertical lift from a service passage through Levels Seven, Eight and Nine ('the bones') to a four-way junction whose third corridor ends in a sealed slab leading to the Archive.
From the books
“And down in the sublevels, a man named Mekhi had proof, or had tried to.”
Part 1, Chapter 6: The First Thread, p. 144
“She kept moving toward the deep South Shore.”
Part 2, Chapter 17: The Choir Arrives, p. 127
“He began moving inland through the nearest service seam, fast now, not running, just committing.”
Part 2, Chapter 18: Superposition Error, p. 139
