Rule 1: Prepare for the worst.
How to keep cool:
- It always helps to be prepared. Knowing that will help.
- Resist the urge to panic. Act calm, even if you don't feel that way.
- Breathe the correct way. Inhale through the nose and exhale slowly through the lips.
- Focus. Think through what you are about to do.
- If safe, Do something. Start moving.
- Ask yourself: What's the point of worrying? What does it accomplish?
http://www.howcast.com/videos/387796-How-to-Keep-Your-Cool-in-a-Crisis
http://www.popularmechanics.com/outdoors/survival/stories/4331486