Are coal mines hot like deep metal mines? In The Deep Dark [0], it started that many of the miners skimped on safety devices even when available because of the

Are coal mines hot like deep metal mines? In The Deep Dark [0], it started that many of the miners skimped on safety devices even when available because of the extreme temperature and humidity if nothing else. [0]: https://www.amazon.com/gp/product/0307238776/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 https://www.amazon.com/gp/product/0307238776/ref=oh_aui_sear...