Do other people hear it to? Have you recorded it?i appreciate your replies but i am not looking for a protracted to and from by email on this subject.. I can ASSURE you i have absolute and total clarity on this matter and my description is as accurate as it can be when you are describing something you have never encounter before and never heard ever elsewhere. I am an ex submariner and in my fifties. So for the avoidance of doubt, i say again, this sound is not and cannot be mistaken for or be emanating from anything man made or mechanical (in my opinion). Why; the sound is everywhere and has no particular direction, there are no bangs, thumps or anything remotely similar. It is omnipresent, and "appears" to be atmospheric. I have looked on the internet and you put aside all the conspiracy theories and reports of bangs , bumps droning, bass noises, these are not the same. However there are a large number of reports and accompanying videos that DO ACCURATELY described the sound i am referring to, and these seem the be spread across the world, with a recent emphasis here in Spain. I am less than half a mile from the sea and am very familiar with all the noises that could emanate from the ocean. This sound is so VAST that you automatically discount all these possibilities. imagine a noise that is so loud, does not vary in strength, does not osculate, does not sound as if its even directional. Before I pull the curtains on my double glazed patio doors, I expect to see a very windy outdoors, but instead it is totally still, the trees or leaves are not moving at all, and yet a strange wind noise... now in conclusion and not wishing to enter into the bizarre, i have read the possibility that the sound could be coming from below the ground.....WOW, well it does not feel like that but i suppose its a possibility. After all the earth i believe is due to change slightly on its axis and the strong magnetic field etc could be causing this i suppose. But if this is the case why would the sound stop? thank you for your indulgence and i am signing off and will not return to this forum, unless i can provide more information on the sound itself.. .