Tamsin and Bram, new apprentices focused on the foundational thermal regulation of the town's energy supply, investigate a severe cold anomaly in the Star Box Repository sub-vaults. They discover that the ceremonial Wintergreen Wax is completely drained of heat, indicating a large-scale thermal siphon rather than mere energy drain. Bram realizes this may be connected to the acoustic disturbances reported elsewhere. Breaking protocol, they open a long-sealed access hatch near Thermal Lock Point Beta, finding the tunnel unnaturally warm and filled with deep scraping marks in the earth. They discover that Grotto Seals, normally used for cooling, are being intentionally embedded in the tunnel walls, suggesting the saboteurs are actively channeling and redirecting the town's heat energy to an unknown location. The episode ends as Tamsin and Bram follow the scraped path deeper underground toward the source of the heat manipulation, anticipating a confrontation with the mechanism causing the disturbance.