The largest section of this map is a series of interconnected flooded basements. Pressed down into the riverbanks and unmaintained, these spaces have flooded and have been interlinked by something that lives down here – perhaps ghouls, or something altogether alien that has settled here.
This map is relatively isolated from the overall undercity – accessed by wandering down the sewers from map 1R, or through secret doors to the already isolated sections of map 1P. The flooded basements have been sealed off from the surface for a generation or more now, but the moisture seeps up and the housing here suffers from it. The only surface access is a sewer maintenance access on the lower right.
I’m particularly happy with how this section came together. It feels run-down and decrepit – a reminder that there’s a lot of garbage under the city – that the history of the place isn’t all grand temples, cults, and the great clans – but also half-assed construction work, forgotten soggy places, and crumbling debris.