Doom 2, Speed Of Doom - MAP09 (12 minutes extended)

This sounds like when you do a certain task, but it's far from completing it. You are ready to get to it with confidence. What was kinda funny, is that there is MAP16 called Core and the name of this track is Core. I was a bit confused, but I guess this also works.
Game: Doom II, Hell On Earth (PC, 1994)
Game by: iD Software
Map Pack By: Josh Sealy (Joshy) and Darkwave0000
Composer(s): Stuart Rynn
Soundtrack: Core
This soundtrack has been extended for 12 minutes. Enjoy!