UNIT-Detected Obsolete SOS Signal (Space Control Transmission)

The Doctor’s obsolete SOS signal is the linchpin of this event, serving as both a clue and a lifeline. Detected by Johnson across civilian and emergency channels, the signal’s high-impulse blanket frequency indicates it was deliberately designed to bypass Carrington’s jamming efforts. Its obsolete nature catches Benton’s attention, confirming its origin as the Doctor’s attempt to reach the alien ambassadors. The signal’s widespread reception—picked up by taxis, police cars, and fire engines—underscores its urgency and the Doctor’s desperation to break through the communication blackout. This signal is not merely a distress call; it is a tactical maneuver, a cry for help, and a potential key to unraveling Carrington’s conspiracy.