What is required for every person working underground?

Every person working underground is required to have a positive means of identification to ensure that all workers can be accounted for and to maintain safety protocols. Having a reliable identification system is paramount in the event of emergencies, as it allows rescue teams to quickly identify personnel and determine who may be unaccounted for. This is crucial in maintaining the safety and organization within the mine environment, where visibility can be limited and conditions hazardous.

The other options, while important in specific contexts, do not encompass the fundamental requirement for worker identification in the underground setting. A flashlight may be essential for visibility, a map of the mine is useful for navigation, and a safety harness is vital for height-related safety tasks; however, without proper identification, the risks associated with losing track of personnel significantly increase, overriding the importance of those items. Therefore, a positive means of identification serves as the baseline necessity for anyone working underground.