The only part of this "deep note" that I like is the very end; top of the crescendo. The first part has always creeped me out worse than watching Hostel for the first time.
Without the first part, a whole orchestra's worth of sawtooth oscillators playing octaves is pretty boring. The effect of the beginning is to build tension, which is released at the point when all the oscillators converge on the single note.
Tension and release is the basis for most (if not all) music. Whether its in the form of a V7->I cadence, which builds tension harmonically with a tritone that "wants" to resolve to the root. Or the "riser" before the drop in electronic music, just a single note with it's pitch going up and up and up or a filter sweeping through white noise up and up and up with drums doing more and more subdivisions until a second of silence and then boom...the main theme. In and of itself it may be interesting but only within the context of it being the release of tension built up previously does it have that profound effect.
