deliberately flown along a route to avoid detection. meantime planes and ships are heading for an area chinese searchers have now device detected electronic pulse signals from the southern indian ocean. the australian ship ocean shield has also picked up acoustic noise as well. we could be closer to finding the so called black boxes. that is the flight data recorder and cockpit voice recorder. cnn zane asher visited to find out how they store information and how that information is downloaded and read by investigators once its retrieved. >> crash protected and shock mounted. >> this is what investigators will see once the black boxes for flight 370 are found and data is downloaded for analysis. >> we'll see the data in