survival expert joseph todai host of discovery channel's "survival." it was 20 degrees below zero sunday night into monday morning. that seems like no margin for error here. >> you're absoly right. one of the things about a winter survival situation is that mother nature will not allow you to make too many mistakes at all. >> and it seemlike they did a whole lot of things right. heating rocks, bringing them into the car. was that a life-saving move? >> absolutely. i got to tell you, this guy made all the right decisions. and what's really crazy is we did an episode last year on survival almost exactly what these people went through. and i can tell you, it's not the one big decision that he made for his family, it's all those little decisions that lead up to that big decision. staying with the vehicle, letting people know where you went, staying warm, making a fire. he made all the right decisions. and even more so, he didn't panic. because if he would have panick, i can almost guarantee you he would have done what the people in the scenario that i