In which scenario is it crucial to have a barrel of water available when handling ammunition?

Having a barrel of water available is crucial for submerging leaking ammunition because it serves as an immediate containment and safety measure to prevent potential hazards. If ammunition develops leaks, whether due to deterioration, damage, or other reasons, submerging it in water can help to neutralize the risk of ignition or detonation. Water acts as a barrier, preventing explosive materials from coming into contact with the air, which can be a source of ignition. This method is particularly significant in explosive safety procedures, where controlling potential hazards is paramount. Proper handling of leaking ammunition can mitigate risks to personnel and the environment, thus emphasizing the importance of having a readily accessible water source in such situations.