Which of the following statements is true regarding SCSR training?

The statement that all underground employees must receive training at regular intervals is true because regular training ensures that all personnel are adequately prepared to respond effectively in emergencies, particularly in the context of self-contained self-rescuer (SCSR) usage. This is crucial in underground mining operations where hazardous conditions may arise suddenly.

Regular training helps reinforce knowledge and skills, ensures that employees are updated on any changes in procedures or equipment, and fosters a culture of safety. Given the potentially life-saving nature of SCSRs, maintaining a high level of competency is imperative. Therefore, making training a requirement for all underground employees promotes safety and operational efficiency in the mine.

Other options do not align with established training protocols and safety regulations that prioritize the preparedness of all employees in hazardous work environments.