Many amateur radio operators still use Morse code, because it amuses them. I had a ham friend who spent hours with his low-power CW (Continuous Wave, meaning suited to using Morse code) rig, trying to exchange messages with people as distant as possible. He never went to voice.
Also, some public service radio transmitters still ID themselves (usually on the hour) using Morse code.
All I'm saying is that there's nothing in the least wierd about Morse code transmissions.
Now if you want to learn about radio transmissions that have no very good explanation, google "number transmissions" or "number stations." It's pretty likely that those stations are involved in espionage.
Finally, let's remember that HF (high frequency) radio equipment can be simple, easily-maintained, very robust, low-powered, and (depending on frequency) can have a very long reach. I've lived places in the world where every mode of communications but HF radio was unreliable, but a simple HF transceiver did the job every day. I have video of a little government office in the southwestern Pacific where out the window you can see the sat telephone system the EU donated, which failed almost immediately, and a friend of mine easily ordering medical supplies from another island and arranging for an ambulance, all via HF radio.
It's not sexy, but it works very well.
