While many of us are used to the comforts of air conditioning and Netflix, our ancestors didn't get to enjoy such luxuries. They lived off the land, and some survived in the harshest environments on Earth. This can make us wonder – would we be able to survive off the grid? With no supplies? While most of us just use this as an interesting thought exercise, some ordinary people actually have been put to the ultimate test of survival. And they've been forced to do some pretty horrifying things to survive.