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Doctor mayday radio

The Doctor holding an aerial to send a mayday. (TV: The Sea Devils)

"Mayday" was a codeword, used to signal distress.

When the Doctor and Jo Grant became trapped on a sea fort the Doctor improvised a radio transmitter from a receiver to send a mayday. (TV: The Sea Devils)

Mayday Lowe

Supervisor Lowe sends out a Mayday after the Swarm attacks Titan Base. (TV: The Invisible Enemy)

Munro sent out a Mayday call when the Prince Charlie oil rig was attacked by a Skarasen. (TV: Terror of the Zygons)

Discovering that Titan Base was under attack from persons infected by the Swarm, Supervisor Lowe sent out a Mayday distress call. (TV: The Invisible Enemy)