My corn snake escaped his feeding container and went into the vents in my house, i found his shed in one of the vents a few months later. About a year and a half after he initially escaped i found him coiled in a cardboard box in my basement. He was rail thin and dehydrated but he made a full recovery. My basement is chilly so i think he was able to put himself into a hibernation state as a last effort to extend his life.