Fabula
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Object

Doctor’s Jury-Rigged Morse Code Signal (Underground Lab Transmission)

A modified Morse code sequence (di di di dah dah dah di di di) transmitted via a jury-rigged device in the underground laboratory. Designed for stealth to evade Carrington’s forces and contact the alien ambassadors directly, marking the Doctor’s independent strategy.
1 appearances

Purpose

Transmit secret message to alien ambassadors without detection by Carrington's forces

Significance

Doctor's desperate bid to contact aliens and expose Carrington's invasion plot, preventing war escalation and highlighting his strategic partnership with Liz Shaw

Appearances in the Narrative

When this object appears and how it's used

1 moments
S7E18 · The Ambassadors of Death Part 7
Doctor tests alien communication device

The Doctor’s modified Morse code signal—di di di dah dah dah di di di—is the covert message transmitted via the jury-rigged communication device. Designed to be subtle yet effective, it is intended to reach the captive alien ambassadors without alerting Carrington’s forces. The signal’s failure to provoke an immediate response adds tension to the scene, as the Doctor and Liz are left wondering whether the aliens are being actively suppressed or if the signal simply wasn’t strong enough. This moment foreshadows the need for more drastic measures, setting the stage for the Doctor’s eventual SOS signal to UNIT.

Before: Untransmitted; the Doctor has prepared the sequence but has not yet activated the device.
After: Transmitted but unacknowledged; the signal has been sent, but no response has been detected from the aliens or the observation room.
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