Morse code transmission over the Voice of Turkey's signal2
Using SDR# I extracted the coded signal while suppressing the rest of the audio (recording embedded in the player below):
My Morse knowledge is patchy to say the least, so I decoded it using Fldigi. At the start of the recording, the sequence "8T1" is repeated a dozen of times. I Googled around and found another YouTube video of a Morse code transmission from a numbers station, reportedly codenamed M01, which also had multiple repetitions of "8T1".
Numbers stations are still sending messages from many different corners of the world. However, if I indeed captured an M01 transmission in this instance, what makes it unusual is that it was embedded inside a signal from a broadcast station and that it was strong enough to be heard clearly. I'll watch out for further occurrences of M01 on the airwaves.
Update: I received the following pointer from @priyom_org:
@LondonShortwave Not M01, but rather M14. Sends daily 1900 UTC on 9463 kHz and repeats 1930 UTC around 7353 kHz.— Priyom.org (@priyom_org) 16 June 2016