This is a fantastic sewer-crawl that perfectly blends modern urban horror with classic dungeon-delving. The writing is clear and the hook is excellent, immediately building a sense of mystery. The layout is clean and the map is clear, functional, and atmospheric. The random tables for environmental hazards and encounter twists are a great touch that makes the adventure feel dynamic and replayable. While the 1960s setting is a step away from traditional fantasy, the core concept of a strange, serpentine cult festering beneath a city is a great horror premise that feels right at home with pulp fiction.