if you want to hone the beam right in tight, you don't cover as much area but you get very, very good images. and so at the moment, i think there's a call for more wide ranging sonar so that we cover as much seafloor as possible. >> all right. rob mccollum, thanks. captain van gurley and mary schiavo. thanks so much. we'll talk later on in this hour as well. all right, so much more to this very challenging search in the southern indian ocean. we'll explore that, next.
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