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Here is an interesting story about a fascinating use of cw to communicate with those held by Colombian rebels. Since this forum does cover cw, I hope this radio history article may be of interest--although no mention of HF radio is made-- Morse saves souls again in this saga:
The Colombian army sent a hidden message to hostages inside a pop song

If this is not the correct forum, please feel free to redirect it.
Thanks,

p1879
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