Filmed in Saint Petersburg, Russia. The description says the sound was accompanied by an earth vibration.
My take: All I can say is O M G! This is the loudest recording I’ve posted. The fact that the earth is vibrating makes it even more intriguing. The famous and very loud Florida video described earth vibrations. I wasn’t there and it gives me chills. I think if I were there I would run!

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Makes me think of a dragon, this one.
You should have acted! They’re already here…