Surviving a nuclear explosion depends largely on the distance to the explosion, the power of the bomb, and the environment. However, there are some general guidelines that can improve your chances of survival if you find yourself in such a situation. Here are six official tips often recommended by agencies such as the Department of Homeland Security (DHS) and the Federal Emergency Management Agency (FEMA):

Come in, stay in and stay tuned:
If you are warned of an impending nuclear attack, seek shelter immediately. The best option is a brick or concrete building away from windows. Basements or the middle of large buildings provide the best shelter. Once inside, check official information sources for updates.
Lie flat and cover your head:
If you are stuck outside and do not have time to get inside, lie flat on the ground and cover your head. If the explosion occurs at a distance, this can help protect you from the pressure of the explosion and flying debris.
Seek shelter immediately:
After the initial explosion, you should stay in a shelter for at least 24 hours to avoid the most intense radiation levels. Stay in your shelter unless you are specifically ordered to evacuate by authorities or your shelter is in immediate danger (e.g. from fire).
Maintain a barrier between yourself and the outside world:
Close and seal windows, doors, and all indoor vents to create a barrier against radioactive materials. Use whatever materials you have on hand to seal any gaps through which radioactive materials could enter.
Decontaminate in case of contact:
Remove clothing to prevent the spread of radioactive material. Removing the outer layer of clothing can remove up to 90% of radioactive contamination. Once you are safely inside, shower with soap and water to wash off any radioactive particles that may have settled on your skin and hair.

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