911 operators in Knox County, Tennessee take hundreds of emergency calls, but they're usually from outside the 911 center.
A 911 call from within the center saved Alan Bull's life.
Alan Bull is a manager at the 911 center. Friday morning, he was not feeling well. He went to the restroom, where he suffered an often-fatal aortic aneurysm.
A blood vessel burst. He used his cellphone to call 911 co-workers. Within seconds, Bull's officemates and nearby medics got him the help he needed.
Bull endured a three-hour surgery. Friday night, he was in stable condition at a hospital. (info from WBIRTV)