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See. in the indian ocean they are doing pre-planned missions because the vehicle doesn't come back for a long period of time. they have to use their best estimate to generate this. >> the side scan sonar looks weird. explain how this works. >> this is side scan sonar imamry. it travels through the water, hits the sea floor and continues on. that generates an image of what's on the sea floor. >> anderson, it's interesting because the closer they get the better the image but the higher up the more they can see what is beneath them. so it can be tedious to get a better idea of what is down there....

That generates an image of the sea floor. >> it's interesting. the closer down they get the better the image. but the higher up the more they can see what is under them. >> are they getting realtime images or just data they have to look at later? and also the fact that there is silt down there could that make it harder to identify? >> the first one i think definitely that's a james question. >> they are not getting realtime images. we are able to do that here on the boat. but they put that vehicle down a long time. not only do they have to wait for the vehicle to come back up but they have to ...