Ambient washes that slowly evolve. Slightly dark. Mood music for watching clouds, empty streets on a gray day, tying up your torture victims. Fairly uniform in goodness. And the "sound palette" is pretty narrow also. FCC clean.
*1-8:30) Ominous bass drone. Spooky, echoey tones.
*2-4:47) Windier, slightly lower bass drone. More washed out.
*3-5:53) Quiet, low track. Planes, air raid sirens, moaning wind heard through thick sound proof walls.
4-8:21) Very muffled motor sounds with sudden unexpected echoing-through-a-cavernous-warehouse sounds. High bell tone whistles.
*5-12:14) Slow, periodic, falling moaning, washy tones
6-8:22) Slightly louder, more active faint rumbles, echos, pieces of metal moving around, swirling wind. All still very ambient tho.