. >> reporter: it was long a long night for andrew taylor, his father bob walked away and was missing on a night when the low was just 45 degrees. >> it was agonizing. as the hours went by, you fear for the worst. >> reporter: the fear turned to joy when 12 hours later a worker at a cemetery spotted taylor in the woods. detective thomas stall was one of the first to get there. rescue crews captured what happened next. they worked to warm the 82-year- old uptaking off their jackets, taking him from the woods to the ambulance. >> i don't know how much longer johnson wasn't able to find him there. >> reporter: missing persons detectives tell us those with dementia are often the ones they are looking for. the pinellas county sheriff's office offers project lifesaver, technology that can minutes. metal detector. signal. the signal gets stronger as you get closer to the patient. >> reporter: as for taylor. >> he has a sense of humor. he is trying to figure out what cemetery. >> reporter: yeah, mr. thankful this evening. they say he is in the hospital being treated for hypothermia and he wil