technical just. tree divers are a medical phenomena thanks to special breathing techniques of years of training doris hold a month can hold her breath for up to six months. apnea diverse set records that puzzle science how does the body manage to go so long without life giving oxygen. researches at the university clinic and phone want to get to the bottom of the fish people's secret. their abilities make free divers coveted objects for study. during tests the oxygen content in their arms legs and brain as measured. doris