Which of the following statements about underground power lines is true?

The statement regarding underground power lines that recognizes them as a potential hazard in training environments is accurate. Underground power lines can pose significant risks during training exercises due to the possibility of accidental strikes or ruptures when excavation or ground disturbance activities take place. Even though these lines are underground, the potential for injury or power outages exists if safety protocols are not observed.

In training scenarios, personnel may not always be aware of the exact locations of these power lines, particularly if they are not mapped out adequately or if the area has changed since the last assessment. It's essential to always consider such infrastructure when planning training exercises to mitigate risks and ensure participant safety.

Addressing the other statements, it is incorrect to claim that underground power lines do not present any hazards during training or that they are only dangerous during storms, as the hazards can occur at any time, especially if there are activities involved that could disturb the ground. Similarly, it is misleading to suggest that they are commonly ignored in safety assessments, as safety regulations typically require such assessments to consider all potential hazards, including underground utilities.