CNN CNN Newsroom April 4, 2014 18:05:00
Planes just finished coming in for the night. they're still trying to spot the piece of debris on the surface. >> paula newton, thank you so much. in perth at 2:00 your time. let's focus on the underwater pings. the precious ping sound happened about once every second. but back to the battery. battery-powered ping may soon go silent. let's bring in mike williamson. nice to have you on. >> thank you. >> we're talking about this approximately 150-mile track to use this pinger locater. listening for the click, click, too ultimately locate the black boxes. but my question, is covering that kind of...