I can't believe they don't have a recording/video of the noise and noise level readings. I don't doubt there is noise but I'd like to better understand what the

I can't believe they don't have a recording/video of the noise and noise level readings. I don't doubt there is noise but I'd like to better understand what they are hearing. Also, what about crypto mining is noisy? Is it massive fans or pumps for water? What am I missing? Actual mining is loud, that makes sense, but this is a datacenter, why is it so loud?