would fly to get something like that. they only have one side scanning sonar vehicle right now. a, is this the right piece of equipment given the depth issues and i still don't quite under why not have multiple pings. >> you hear captain matthews say this was a tactical survey. they got an area instead of a point to throw that dart at. we did things differently with air france. we said somewhere in this area is that aircraft and let's start to the west and sweep out to the east. >> you had three vehicles. >> we had three vehicles at once. >> there's no reason you can have multiple vehicles? >> no. they could do that. he mentioned going to high probability areas. again what we would rather do is start with a wider area and cover it completely and then the aircraft will fall out of that. if we say let's do -- instead of 3 x-5 area let's do 6 x 6 area and if the aircraft is there