A rotating ghost market that sets up in the partially-flooded sub-levels of the Lower Shelf — specifically in the drowned infrastructure corridors beneath Districts 3 through 9 — operating from flat-bottomed salvage rafts lashed together into temporary floating bazaar islands. Goods sold include unregistered geneware grafts, pre-Consolidation artifacts recovered from flooded Old Chicago basements, and black-market water filtration tech that predates the Aqua-Plex monopoly. The Silt Markets move location every 48 hours, announced only through a waterproofed paper note system called Drift Cards, which are passed hand-to-hand — deliberately analog to avoid BCI intercept. The markets have been running continuously since 2197, surviving three major corporate sweep operations by the Aqua-Plex enforcement arm.