I've been listening to it for about ten minutes now while doing some calculations. I hear at least four layers of sounds repeating at different frequencies. Nothing I would describe as "digital", like the fax or modem sound I described above. Everything sounds very organic in nature, maybe apart from the distorted hiss in the background. The most constant sound to me is the one that sounds like the submarine drives from 80s cold war movies. The sound is oddly captivating.
Ah, do you mean the cavitation like bubbling sounds? Makes me wonder whether that is anything to do with the UIA drives as well...