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Only a few hams guessed my main tricky hint for creating the correct sequence of HF bands in my Ham Riddle: "Guess the Band by its Sound":  https://youtu.be/Z9AEbV4V82Y?si=Wemjn... 
Of course, the “behavior” of ham bands is not the same in different countries, so it was not easy for someone in America to guess only from the sound which particular HF band I was showing even if the day/time/location/antenna were clearly shown.
That’s why I came up with an additional hint, which, however, remained unsolved by 99% of those who sent answers.
If you saw my last Shorts: 
 https://youtube.com/shorts/0aiO-JVUOj... 
you already know what I'm talking about: the CORRELATION of the wavelengths of different colors and the wavelengths of our HF Bands. 
I painted each fragment with each band in a certain color tone: from purple to red. Accordingly, it was possible to correlate and understand what bands sequence I was showing without even listening to the sound at all!
Congratulations again to the winners:
RV3KV, KQ4DFV, PB7RS, DG6YBE, R7CA, UB3BBB, F4JIK
The first person Dmitriy RV3KV who guessed correctly will receive my main personalized prize (R1BIG thermos), other will receive my special diplomas.
Next time I'll try to come up with something easier ;-) 

Raisa/portable with a shovel instead of masts :-)
I got enthusiastic and did 2 experiments with Underground Antennas:
1. worked on an Underground Dipole in a mono version from the sea shore;
2. used an Underground Dipole far from the sea in the forest, in combination with an 8 meter high dipole, and I switched them with an antenna switch.
TNX for your comments, which helped me (and maybe someone else) to better understand antenna theories and inspire experimentation.
Both Videos links at the end of the post.

What is MY CONCLUSION?
Of course, an Underground Antenna is most often an absurdity/an experiment/an adventure. There is no need to bury the dipole. But what I've learned is that if you want to work from the field, you don't have to have big hight (half-wave high etc) or masts for vertical antennas 

If you don't have time/space/trees/mast or all of that combined, but you have a good PROPAGATION you can hang a dipole just 1-2 meters above the ground (the main thing is to shorten it at the ends so that there is a good SWR in the right QRG, however this is not difficult when the ends are at eye height). 

And IT WILL WORK! After all, even with the Underground Dipole in a mono version, I contacted Siberia at 20 meters and received a good report, and this was 5000 km away.

So it's better to make a low antenna or even an antenna lying on the ground and work on the air than not go on the air at all and just dream of super high antennas.

Links:
Underground vs 8 m high:  https://youtu.be/N4V2H5dzaeU?si=C4O4F... 
Undergroung only:  https://youtu.be/Pp1ZC0e2W8M?si=DH6EU... 

This was a REAL HAM RADIO ! I will always remember this "Night On The Air, make a special video about it and will mention it, when random people ask what our hobby is.
I just wanted to be QRV briefly on 20 m and try to make a "CQ DX" call. 
Promptly many stations from North, Central and South America, including rare islands (s. picture) called me at the same time! I could not move away from the TX the whole night. 

This "DX Pile Up" gave me 20 new countries for my new Call OH7BG!
Would you go to bed if you were called by dozens of stations at the same time, each of which is a desired DX for you? 

As you know, one of my goals is to get more young ladies and young people to our hobby.
Remote Ham Radio is one of effective ways to make it easier for them.
Happy to announce : right now the International YL and Youth Remote Operation is running on Air remotely (Special call VA3YLR) 
Start time on 17.04.2022  13:00  UTC. 4 hour duration.
We will start on 80M, 3.710 +/- and move to other bands as conditions allow.

My first remote operation with Rob from Canada was on February 6th, 2022. Then this project was developed and now YLs from 5 different countries and Youth from Canada and Serbia take part. 

The Youths from Serbia are newly licensed so let's give them a great experience!
All our ham remote activities take place under the permanent control of Rob as supervisor, with a local special Canadian call sign.
We will continue! 

Dear friends, 
please wake me up from a nightmare. During these terrible days and nights I could not make any posts. I took a pause. You see, my ham radio content always radiated positive feelings but now those feelings are not possible. Therefore, I was silent.

Thanks to everyone who asked how I'm doing these days.
I am still in Finland now, but after some time I have to return to my home сity St.Petersburg, where also my mother lives.

Since there are a lot of blocking sites and social networks between countries now, I’m not sure that after returning to Russia I will be able to publish my Ham Radio posts and videos regularly as before, although I will strive for this.

I hope that I will be able to be QRV portable from St.Petersburg with R1BIG/p. 

...Several videos were ready to post, including a QSO Tutorial video with a wonderfull YL Haruka from Japan on how to make QSO in Japanese, as well as others videos. But since I smile a lot there, I refrain from publishing.

During the last days I operated some hours on the air and they were the only hours when I forgot about what had happened, at least for a moment. I made hundreds of QSOs.

...I ask that in social media we would behave as if we were in a QSO on the air: be careful with each word we say, show empathy and remember about social feeling. 
Unfortunately, or even worse than that – as a blow of a disaster – I received a message from a ham :

“I will never contact Russia again on the radio”.

We live now in a time that we should as a family of Ham Radio operators even more show active consideration to our historic role in uniting people of good will. ❤️ 

This is how more people from the outside can learn about our hobby!
A new article about Ham Radio : "Radio Romance!" (link below)
I am especially happy when it turns out to publish something about our hobby outside of specialized ham magazines like this one.
I didn’t write this article myself, so there is a special author's point of view (not from inside the hobby), but sometimes it’s even better so.
if you know articles about our hobby published in not ham magazines, please send me a link in the comments. This will help me gain experience in the future to do similar things more and more!

 https://www.calvertjournal.com/features/show/13657/radio-romance-the-hidden-lives-of-amateur-radio-enthusiasts-and-the-power-of-diy-connection-russia-z?fbclid=IwAR24pm0vhOmP2Gqk32753lw0_QUIFC2IjCWrBQaXZmLY2KPPQMcUMaHlrkg 

Today there was a Ham Live Talk in Russian. I was interviewed by a radio amateur and a wonderful person Sergey Ushakov R6LHJ. I answered live many questions of Russian-speaking hams in my native language. So most of you will not understand anything. But you can take a look ;-)  https://youtu.be/1tTi3tt98nU 

Preparing to print new QSLs for my new call (tnx Ric, DL2VFR)! I made their design dedicated to the Northern Lights - a beautiful natural phenomenon that can be seen in Finland and also felt On the Air as Aurora. The video about my Finnish Call (+ the Finnish Sauna):  https://youtu.be/xF6vj5Aa21I