Shortwave radio noise with whistles and faint voices.
Shortwave radio noise with a sound like mains hum.
A dark tense synthesised string sound.
Cinematic synthesised soundscape with sc-fi feel, ethereal, atmospheric, suitable as background or for movies. Has wind and machinery sounds.
Synth sound with sc-fi feel, ethereal, atmospheric, like an alien signal
sci-fi science-fiction alien machinery