Music by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100209

MacLeod's description:

Genre: Horror
Length: 4:57
Instruments: Synth

Alien soundscape with touches of humanity. Low and smooth; discordant. 037
ISRC: US-UAN-11-00209
Dark, Unnerving, Eerie, Intense 2006