Electrical hum fuzz and buzz.
Swelling electrical hum and buzz.
Dark mysterious drone. With feedback and hum.
Dark airy drone. With hum and hollow warble.
Sound design accent. Hum hit with reverb.
Warped industrial drone with hum.
Static. Airy fuzzy hum and hiss.
Sound design ascending accent. Grind static. Low hum.
Distorted drone with filtered hum.