Juliane Koepcke was flying with her mother and ninety other passengers when lightning struck the plane which caused an extensive structural failure. Everyone fell out of the broken plane!
The excerpt Deep Survival by Laurence Gonzales illustrates in order to survive a life and death situation one must be mentally prepared.
Juliane suffered from cuts and a broken collarbone but was never frantic about the situation. She stayed calm the entire time, unlike the other passengers that were full of panic.
I'm going to find help!
I'm staying here and awaiting rescue!
Juliane decided to make a plan based on the advice her father gave her just in case she got in a situation like this. The others decided to stay put until they started dying off and eating each other when they were hungry.
I'm staying put until someone comes to get me.
I'm going to make a plan to head downhill.
Juliane didn't have any survival equipment with her. She made up a program for herself which required her to rest in the heat and travel when it was cool throughout the day. She walked for days being eaten alive by leeches with strange insects always crawling on her.
She eventually came along some huts along the banks of the river she had been following. She collapsed in one of them. She'd finally saved herself, unlike the grown-up passengers she had been traveling with. She was tough a clearheaded and "luck favors the prepared mind."
Three hunters turned up the next day and delivered her to a local doctor. It's not a mystery how she was the only one still alive without having any survival skills or equipment, unlike the others. She was determined to find help while the others survivors sat down and died.