Shackleton and his team went through an incredible ordeal. It’s impossible to imagine what it’s like to be completely stranded for three years in one of the harshest environments on earth, thousands of miles from the scraps of civilization. Not a single crew member died. How is this possible? Beyond that, the crew kept meticulous notes, even took photos of their ship being crushed by the ice.
An amazing fact: the expedition lasted the length of the first World War. The crew learned about it all retroactively. After all they went through, they returned to a completely different world.