In rare but serious emergencies, the key is staying calm and thinking clearly. A nuclear event is “extremely unlikely,” but knowing what to do can help you react safely. This isn’t about fear—it’s about being ready to act without hesitation if needed.

A detonation creates a powerful burst of light that can harm your eyes instantly. If you see a sudden, intense flash, “turn away immediately,” shield your eyes, and drop down. Avoid windows, as the following shockwave can shatter glass and turn it into a major hazard even indoors.

Seconds after the flash, a shockwave may hit. Your priority is to get behind solid protection. Move into a strong building, preferably a basement. If that’s not possible, stay in the center of the structure, away from windows and outer walls. “The more layers between you and the outside, the safer you are.”

Once inside, focus on limiting contamination. Remove outer clothing, clean exposed skin if possible, and seal the space by closing windows, doors, and vents. “Stay indoors for at least 24 hours,” or until authorities say it’s safe. The first hours are the most critical for protection.

Reliable information matters more than reacting quickly. Keep basic supplies like water, food, a flashlight, and a radio. Follow official guidance and ignore rumors. In serious situations, the response is simple: “Act quickly. Find shelter. Stay where it’s safe until you’re guided otherwise.”