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To hear pingers and start putting submersibles in the watt now. >> yeah. this is -- way on outside of the investigation, but my gut tell me batteries and done. they'll probably give it a couple more days because it's so much more efficient to be listening for pings, if you can find one more spot that would give you narrow it down, narrow down that box ever more the submersible vehicle is so much slower, it's six or seven times slower covering any piece of ocean compared to the towed pinger locator, it's probably worth a couple more days. >> quickly, alan, do you agree it's time to forget about...

It. they're searching underwater now. and before we talked about all the trash on this program that finds its way to the surface. but what about searching underwater? do they face challenges with trash and garbage there as well? >> well, lots of the debris is mostly at the surface. what happens in the water, you might find some things. for example, if the plane crashed intact, you might have some things coming to the surface as it breaks up. those things might be found as they're going from the bottom to the surface. but i would estimate most of the debris is on the surface, moving away from t...

Information we had with 447. the acars messages were sent in realtime. we knew the general location, we knew the emergency the pilots were facing, the inconsistent information they were getting. so there was a great deal of information that was readily available at that time. unfortunately here, we don't about whether the information was unavailable because it was disabled or turned off or due to some other cause. we don't have that kind of information and that will make it more difficult. >> let's talk about the assets out there. right now, it's incredible state of the art technology being us...