When you've hit rock bottom, some say there is nowhere to go but up. Over the past few months, we've chronicled one group of homeless men, for whom "up" is 14,000 feet in the air.
John Sharify and photojournalist Doug Burgess take us back to the beginning of, "The Climb of a Lifetime."
Who will make it and who will fall back into their old lifestyle? Go along the entire journey and watch "The Climb of a Lifetime."