>> chi-le! chi-chi-chi-! le-le-le! [ applause ] >> that was mario sepulveda the second miner pulled to safety leading the cheer. no mistaking his joy. he was glowing, pumped, hard to believe he'd spent more than two months underground. we saw just how resilient they seemed and how happy, obviously, after all they'd been through. few of us will ever come close to experiencing what they have experienced thankfully. not even bear grylls, who has made a career out of testing his own limits. we talked through skype about what it takes. from a survival standpoint, what really stands out to you about this story? >> it's just -- it's such a long period of time, you know? it's hard to kind of get a grasp