Emotional Resilience
People rarely expect being in a survival situation. It can happen dramatically and rapidly or i can happen over the course of days and dangerously subtle. In either case having the ability to regulate your thoughts and feelings can prevent panic that leads to poor decision making. Here is an article detailing what emotional resilience is and how it works. Once again, the more crucial survival tool is your mind.
https://www.verywell.com/emotional-resilience-is-a-trait-you-can-develop-3145235