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Uncertain. so you could have two separate hypotheses and they could be conflicting. since you have overlap and uncertainty, you have to keep them both on the table until you exclude one, until you have credible evidence that takes one completely away. in the air france search, we actually had three separate agencies that did reverse drift modeling using their own current models and databases. it was the brazilian, the french, and the u.s. coast guard. and all three came up with separate, different origins for where the debris came from. it was very frustrating. we didn't really know which ones...

Conflicting. since you have overlap and uncertainty you, have you to keep both of them on the table until you exclude one, until you have credible evidence that takes one completely away. in the air france search, we actually had three separate agencies that did reverse drift modeling using their own current models and databases. it was the brazilian, the french, and the u.s. coast guard. and all three came up with separate, different origins for where the debris came from. it was very frustrating. we didn't really know which ones to use. we ended up just using the coast guard data because we ...

Vehicles to actually look in the water where the plane might actually be. they're solely looking now, or they're going to be looking today. they're going to be looking under the surface. >> because that is what you have to do. that is traditional. >> but they must believe there is debris in that area. >> yes, for some reason -- i mean all last week we talked about reverse drift and engineering where the currents are moving. but he said clearly tonight the entry point, the crash point, all of which leads -- all of this leads us to assume that there can't be that much discrepancy between the cra...

We'll get some better weather. the imaging capabilities today in our calendar day were not good. yesterday they were very good. so, we're getting more and more data that can now be searched through and it looks like based on the meteor logical forecast we just saw that i think today imaging time will be good, as well. >> this is an if, too, but if you say you find this and it's debris, richard, but has moved a long way. now, this is why that half ping was so important. perhaps that half ping indicated where exactly if there is a big piece of the jet it is which is far away from the stuff on th...

Rest of the time all the way to the crash, we simply don't know at this point. >> we don't know. that's the significance of getting into the debris field. the fact this plane flew so far, set to be off the southwest coast of australia, is an extraordinary distance for that plane to have traveled under those circumstances. they are going to have to reverse any debris. remember, also, anderson, any debris they find now, they are going to have to reverse drift back up to the location of roughly 13, 14 days ago. >> that is more and more difficult on every day that passes. atika shubert is in malay...