I used to listen to ultra low frequency radio and heard a lot of different clicks, chirps and growns that are generally associated with ‘earth’ sounds.
Some of these sounds are almost identical, but I’ve never heard any without the help of a receiver. Especially this loud.
Could be the earth is starting to ‘yell’ instead of ‘whispering’ to get peoples attention.
:)
The Ent wives have returned and the Ent husbands are shouting for joy! ;^)
Still wondering about HAARP. Lots of directed radio energy bouncing off upper atmospheric layers and causing unusual audio phenomena on the ground. Maybe HAARP has switched to a new operational or power mode.