A sunken district occupying what was once a lakefront industrial zone, Gravesend Basin sits three to eight meters below the surrounding city grade, the result of decades of subsidence, failed remediation efforts, and a catastrophic drainage collapse in 2161 that the city never fully addressed. Rainwater, runoff, and leaked coolant from upper-level infrastructure pools in the Basin's lower streets, creating a permanent shallow flood in the deepest sections that residents navigate by elevated walkways, repurposed boats, and improvised bridges between buildings. Despite — or because of — its abandonment by city services, Gravesend has developed a fierce internal community.