Keeping calm under pressure gets more done than panicking.
When you panic your energy and focus is taken over by the stress and anxiety, instead of being utilized to solve the problem.
Keeping calm is to tell yourself, and believe, that you are in control; that you are confident about the outcome. This leads you to divert your energy toward finding a resolution instead of worrying yourself to a dead end.
Keeping calm under pressure is to announce to the world, and to yourself, that a positive solution is a certainty!