A few years ago one of my friends worked at the LHC making some equipment to help correct beam drift. (I emailed her for clarification) Apparently the particles go past any fixed point in the ring at about the right frequency to land in the audible range. To get data samples, she ended up camping out with audio equipment underground in some emergency bunker next to the beam while they cooled it down and spun it up. She was stuck down there for hours - the only entrance was through the beam tunnel, which was superchilled (and radioactive? I've emailed her for the full story.)
Anyway, I got some of the audio recordings off her (because why wouldn't you??) and they've been sitting on my computer for the last couple of years. I just saw an AMA by some CERN researchers who also have never heard the beam. And people on quora who say the same.
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