advanced software that goes with this equipment. this ping normally is not audible by humans. it's not just something that you can listen and hear it with your ear. so the software actually does a lot of processing to create the picture and audible signal that they here. so the folks on the ship do the audio processing and then send that data off to the headquarters. and from there, it's a team effort. >> thank you for joining us, we appreciate it. >> one of the most puzzling aspects, after more than a month, not one piece of debris from the airliner has been recovered. but searchers from several nations are still looking. our matthew chance filed this report after taking off with a new zealand flight crew as they scanned the sea. take a look. >> the search for any sign of