Sonar Perspective News Today

And silt, how challenging is it for the search? >> reporter: don, you can see were out on the boat, i want to introduce you. just -- the indian ocean weve there.how rough it is to work can you put it in perspective for us? >> from a sonar perspective it is actually a good environment, it is very deep, you want to get the sonar down very deep. but the complexity of the depth, to get the sonar down deep you have to put it on the auv. it has to have navigation, communications and dive down deep. it...