CNN CNN Newsroom April 13, 2014 01:38:00
Monitor the ocean below. the search teams say their greatest asset is the human eye. to avoid fatigue, crew members are switched out from the 11-hour flights every day in the search zone they scan the water in 30-minute shifts to maintain con concentration. >> have you spotted anything on this ship? >> no, no, unfortunately not. we're just going to carry on though. so, yeah, we will be in half an hour. see how it goes. >> reporter: even after so many weary hours of searching, fatigue has yet to dampen hopes of finding flight 370. matthew chance, cnn, over the indian ocean. >> so right now 12 p...