freighter containers. they could be masses of garbage that's just drifted together. they could be anything. and then we're just back to zero again. >> and i understand there is some difficulty obviously where this part of the ocean is in terms of the search efforts. earlier this week i was looking at underwater robots that may be used in this search. is that something that you think could be deployed here? could that help? >> those underwater search systems can be deployed but not at this point. until we actually have a higher probability of where the aircraft might be, we would not bring the systems in to the search at this time because they are designed to be used in a much smaller search area. so these systems are not going to be used at this point until we have a probability of where the aircraft would be.