A Peterborough man, buried for more than three hours, is alive and and telling his story of survival.Watch the reportDrew Mullins, 48, was clearing off the metal roof of his Peterborough home Sunday afternoon when snow came rushing down on him. His wife and daughters had just left on an outing and in an instant, it happened:"I heard kind of a snap sound and turned around and the snow just kind of came rushing down and knocked me over," said Mullins.A virtual avalanche of snow slid off the metal roof with such force and speed, it knocked him onto his back. Within seconds, Mullins was buried under 3 feet of snow. He says his head was twisted to one side."At first, I couldn't move at all, and you just start thinking about things you don't want to think about. While I was under there, just from breathing heavily, the snow above my head had melted to the point where it created a 4- to 5-inch hole in the snow.  So I could actually see the sky."More than three hours went by and then finally, Mullins heard his wife return home. "I started calling out because I thought I heard a car pull into the driveway and she heard what she thought sounded like a whisper she said, but she was able to get to me and call the police."It took first responders about 20 minutes to dig Mullins out. Then he was taken by ambulance to the hospital.Wednesday, Mullins said he was sore and suffered from exposure.Mullins says this could happen to anyone. "I would tell anybody just be careful, because you just don't know."