This is the tenth track on the Quake Soundtrack. It mostly consists of a deep, dissonant pad, layered in with slithering loops that sound underwater.
Level name: "Gloom Keep" (E1M5), "The Wizard's Manse" (E2M5), "The Wind Tunnels" (E3M5), "Hell's Atrium" (E4M5).
Song Credits
Music: Trent Reznor
Sound: Trent Reznor