Yeah, I remember the YouTube videos. I love abandoned mine exploration videos. You should definitely check out his channel and the many others. People do this all over the world. Some of it's kinda sketchy, real horror movie material at times, kind of the inverse of rooftopping. I enjoyed learning the lingo and reasoning behind everything. Mining had and has its own language just like computers and everything had a purpose and the people who do this kind of thing tend to know what they're talking about and interview a lot of people who really know what they're talking about.