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=USUAN1100418

MacLeod's description:

Genre: Soundtrack
Length: 7:20
Instruments: Basses, Violins

Just a very long pad for use under dialog. 037
ISRC: US-UAN-11-00418
Dark, Intense, Suspenseful, Unnerving 2008