Researchers try to get to the bottom of breathing skills By William J. Cromie Harvard News Office Tanya Streeter dives as deep as 400 feet on one breath, which she can hold for more than six minutes. (Photo by Phillip Shearer, courtesy of Tanya Streeter) Have you ever felt "air hunger"? People with asthma, emphysema, and obstructed lungs feel it often - a sensation that they can't get enough air..