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Extent of the breakup once it hit the water. >> reporter: now nine days since the airbus 320 went missing and so far no signals have been detected to help hone in on the critical black boxes. >> the voice recorder in the cockpit tells you what the people are saying. it also records sound. you might hear a bang for instance. you also have this data recorder that's telling you what thrust settings the engine was on. you can really recreate in a great level of detail what was happening with the plane and why it came down. >> reporter: also indonesian officials indicating that yards did not have a...

Set, we have the so-called black box. i never knew by the way, why they were called black boxes given that they're orange. you have the critical flight data recorder and the cockpit voice recorder. this is what thir they're hunting for. these things are sturdy. they're going to retain the information. once they do recover these, what's the most critical piece of information they're going to hopefully glean from it? >> well you don't really know what the critical piece of information is until you look through all the pieces of information and can hone in on the one -- >> what they can get, what...