© YouTube/TVS Saotomedasletras
As you may know, São Thomé das Letras is believed to be one of the seven energy points of the Earth and is thus an attraction for mystics, spiritualists, and alternative societies.
Although this new sound attracted considerable attention, its source remains a mystery. Some residents and officails believe it was the sound of jet turbine hovering the city. But the problem with this 'aircraft' hypothesis is that the noise was constantly heard more than five minutes without any interruption.
Moreover, no planes or helicopters were spotted in the sky. So what might have caused the weird noise heard in São Tomé das Letras, Brazil?
Notice how the sounds seem to increase and then recede. Low flying military jets on manoeuvres perhaps?
Listen to this for comparison [Link]
The fairly low cloud cover may have hidden any possible jets from view.