Radio stations. Ever heard of them ? Most likely you haven't.
They are short wave radio transmissions that have existed since WW2 and the Cold War.
Fine you say they were used to transmit secret info during that time. Problem is some of them never stopped.  Worst some new ones keep showing up.
They mainly transmit a simple repeating sequence of buzzing clicks with the occasional number or word in it.  Sometimes they have gaps of years between the change in the transmission. The weird is they happen all over the world and up to date no government, organization or person has taken responsibility for any of them.
It is suspected some of them are spy messages, military comms or even nuclear code checks. What dark mistery could be behind these?
Whatever it is we will keep listening to them.

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