diana's condition is not improving. >> is it your lungs? >> dr. broder has to do something drastic. he grabs his stethoscope -- >> michael's coming out. >> -- and plunges into the water. first he tries the inhaler again. and then he returns to the boat and rigs this oxygen tank. he scrjumps back into the water desperate to get diana some air. >> i'm hyperventilating all the time. >> i bet you've never seen an e.r. advice the livisit like th. it doesn't seem to make much difference. every few strokes now she stops and she gasps for air. despite it all, somehow she keeps on swimming. diane nyad's body is failing her and it's her will and that dream that has taken over. pressing on through sunset, past the 24-hour mark, and into the