Hey Michelle. I just watched that video you recommended. They are freakish sounds, it would have scared me as a boy to hear it. I could offer my adult opinion about it.
It could be on the ground, despite him saying it was in air, sometimes the perception of where a sound originates can be distorted by sound reflections. Not many folks know this that a sound can be bounced around. It could be the wind passing through a pinch point or a mechanical contraption of some kind or another for example. It actually could be a broad range of things. But what I do know for sure is that there is nothing in the atmosphere which would cause any wind resistances, no invisible things and what I know for sure about dimensions is that the natural laws don’t overlap or mix together or blend, so we can be sure that the sound was local and only from a locally produced audible source. We can be sure of it because of the natural laws as I said. The audible waves can only be produced in a certain limited number of ways and what’s more the audible carrier can only traverse so much distance in any particular direction and for it to be heard it has to be hitting something. Also the human ear doesn’t pick up the full range of audible sound. Another aspect is the camera mic doesn’t either, it is like a picture of something which is actually something else because it has been blended together. Our interpretation is some weird thing because we are not hearing the source correctly. Also the audio could have been dubbed over with a computer that is another possibility. But I reckon if real, its a local source on the ground, like a mechanical thing with wind being pushed through it because of a wind funnel to make the wind faster, to make the air higher pitch. There is several phenomenon that generate this naturally. The Dyatlov Pass Incident in Russia in 1959, some scientists reckon that the hikers heard a hideously frightening sound from on the top of the mountain which probably shook them to their core and made them so scared they behaved irrationally. This sound is produced when a certain wind passes another wind at a certain speed over a certain type of valley and it makes a low rumble which makes a high pitched noise too. It’s horrifying, especially for religious folks, even atheist British military men find these noises uncomfortable and unsettling, so a religious person may cut a whole in the tent and walk around in the woods until they freeze, erratically.
There is many sources of noises in nature which are purely natural and normal, even if rarely formed by weather.
I wish you utmost peace and happiness in your life, be a calm and confident friend to others.