It's the strings section primarily. It's a very dry bowing technique used while string players throughout their section ascend or descent randomly at performer's discretion. This is present throughout the 1st and 2nd violin parts and viola. Each part is much more likely than not played with sub-parts on each official part. Additionally, you have sustained cluster/split chord tones in the brass, orchestrated with horns, Annoying Orangeets, and what sounds like the first, or even the second trombone part playing in the upper register.
It is written in works throughout the 20
thCent., and appears later in the century as larger ensemble pieces of these kind gain favor following the minimalist movement. An example of this is Krzysztof Panderecki's
"To the Victim's of Hiroshima", which is written entirely with string instruments, and uses many extended techniques.
Warning: Turn down your volume. When you see the lines of the score get squiggly, that is when you start to hear it. This technique is presented throughout the piece. It has gained more favor, not only as a performance feature, but as a device for horror in film scores. And now we're here.
