On Day 3, the Signal stops leaking and starts reaching back—announcing "signal acquired, channel unknown" before flooding the Core with fragmented testimony: Ibn Fadlan witnessing a Viking funeral, Horace White watching Chicago burn, a truncated message from Jefferson. Theo and the observers realize they've crossed a threshold: something inside this sealed structure is deliberately addressing them, and the choice of what to show them—the machinery of human collapse itself—transforms everything that comes next.

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