When the coal mine is not producing at night, it should be equipped with safety personnel. Every shift is required by the state, not just the night shift. It is clearly stipulated in the safety regulations. The safety regulations are based on the safety production law and are relatively clear. It is a special industry and needs a special safety management department. A coal mine refers to a tunnel or tunnel dug underground for coal mining. Coal mines are located underground and are dug to obtain coal from underground. Coal mines can go hundreds of meters underground, or even deeper.