Sign of Apocalypse? Thousands of people gather to hear strange noise in China

I’ve concluded myself this noise should come from Reptilian Secret Underground Base.

If you see huge windmills or huge solar farm, there is Reptilian Secret Underground Base beneath it. They have independent source of energy harvesting in addition to the power grid.

Huge windmills over the mountain on the following video.

Why people can hear strange noise? That’s something to do with Reptilian Secret Underground Base.