Hammerfest sits far above the Arctic Circle as the northernmost town of its size on Earth, and for two months each winter the sun never rises at all. This episode of the Extreme Cities series follows residents through that stretch of permanent night, documenting what locals and researchers call polar stress syndrome, a cluster of psychological effects tied to prolonged darkness and disrupted circadian rhythm. Interviews with townspeople cover sleep problems, mood changes, and the coping rituals built around candles, artificial light, and community gatherings that keep the town functioning. Cameras track daily life in the streets, harbor, and homes, showing how a working fishing and industrial town adapts its schedule, work patterns, and social life to conditions most viewers never experience. The film treats Hammerfest as a case study in human adaptability, asking what continuous darkness does to a body and a mind, and how a community organizes itself around an absence rather than a presence of sunlight.