Which of the following is NOT a design criterion for underground explosive storage?

The design criterion for underground explosive storage involves several critical elements aimed at ensuring safety and compliance with relevant regulations. One fundamental requirement is to keep detonators stored at a specific distance from explosives to minimize the risk of accidental detonation. Therefore, having detonators placed three meters away from explosives is indeed a design criterion intended to enhance safety.

The other options relate to the overall safety and accessibility of the storage area. Keeping the storage area free of rubbish ensures that there are no flammable materials or obstacles that could inadvertently lead to a hazardous scenario. Adequate marking with a flashing red light serves as a warning signal and helps identify the explosives storage, enhancing safety awareness for personnel in the vicinity. The criterion of minimizing the risk of impact, burning, or burial is critical to prevent potential accidents that could arise from various environmental factors.

In this context, the correct answer reflects an option that does not fit within the established safety design criteria for underground explosive storage. The safety protocols emphasize measures to minimize risks associated with detonators and explosives, confirming that the specified distance between these critical components is a foundational safety practice.