xkcd #3307: Spectrum Allocation
Title text:
Rumor has it that they're finally auctioning off the zeppelin navigation bands, but everyone is worried that the scary boat captains will express interest.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3307/
part of it is that the sounds are prerecorded so there's that monotonicity to it, but it feels like they almost intentionally make it sound as creepy as possible outside of that as well