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| live =N/A}}This is the sixth track on the ''Quake '' Soundtrack. Its percussion loop is manipulated into sounding similar to a pulsating heartbeat, joined by deep synthesizer layers then eventually left alone.

Level namenames: "The House of Chthon" (E1M7), "The Underearth"(E2M7), "Azure Agony" (E4M7).

[[Category:Related to NIN Songs]][[Category:Rare NIN Songs]][[Category:NIN Instrumentalscredited to Trent Reznor on a soundtrack]]