Extra clips for Further understanding. I told you they Scream, they scream for dominance over eachother and to create sound to see by sonar. In the 80s, Siberian miners drilled a hole miles deep into the earth and the drill started violently shaking indicating they had reached a pocket of empty space, it turns out they Had drilled into a cave filled with Vril.
They stuck a microphone down there and used the only terminology that they had and said they heard the "Screams of Hell".
They heard screams of Vril, in what Humans would Consider Hell, and have done by working this reality into a myth of an underworld.
That is what is happening here.
Vril, are what you are hearing.