we're happy. >> david marchand is charting the best course he can but conditions are not what he'd hoped. >> well, for a swimmer it's rough. we could have done with a longer, flatter compact, which we didn't get. >> it was beautiful when we started and it got choppy quickly. >> barbara stoll's eyes never leave her best friend. >> i feel bad for her out there but i feel good she's powering on. >> powering on requires near super human effort. now diana's body is in survival mode, diverting blood to essential organs, the heart, the lung, the brain and to the muscles propelling her through the water with every stroke. she's likely burning 700 calories an hour now. >> her stroke is not changing at all. she's swimming a stroke and a