I heard a number station this evening on my shortwave radio! (2017.09.21, 20:42 UTC)

I recorded a part of the transmission and I uploaded it to YouTube.

Number Station (English) (5186 kHz) (2017.09.21, 20:42 UTC) received in Hungary

I just randomly tuned my amateur radio transceiver on the shortwave bands this evening and I heard this. The station said some numbers in English and then disappeared. I recorded only a part of the transmission, not the whole transmission.
I have found another Number Station video with this frequency (5186 kHz) on YouTube (uploaded on 2015.09.17) (Link) and I see people asking "What do the numbers mean?"
I don't know what do the numbers mean and looks like no one knows.
The "00000" at the end is probably means "end of message" or "end of transmission", but other than that I don't have any guess.
A lot of people say in other parts of the internet that this is probably a spy or a secret service station. This is one of the biggest mysteries of the shortwave radio listening, I guess.

My equipment:
Radio: Yaesu FT-450D
Antenna: Inverted-V (7 meters above the ground)
QTH: Hunyadfalva

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