Creeping Death
Consigliere
This is a video made by a guy who explores old mines. In this particular video he went to a mine to review a flashlight and got some weird audio. It starts around 11 or 12 minutes in.
This guy doesn't post any paranormal crap or clickbaity stuff. I've seen quite a few of his videos and most are just him dicking around in old mines and documenting the history of it or finding interesting old shit. This is why I'm not quick to think he set this up, although that's always a possibility. Other youtubers have done audio analysis and seem to be of the opinion that the audio is in the video and not edited in. This doesn't mean no hoax, as he could've set something up in the mine, I just don't see this guy going out of his way to do it, but you never know.
Earphones recommended.
Wind, escaping gas and water can make all sorts of weird noises in certain areas, as can a variety of wildlife. He mentions in the video snakes or birds/bats, I think he just mentions this in an attempt to keep his cool. The noise sounds like human speech, repetitive whispering. Earlier in the video he walks by a rope more recently positioned to access an above stope area of the mine, which he doesn't explore because of safety reasons. Someone could've been camped out in there fucking with him.