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Jeopardy so it aborted the mission, came back up without finding anything. they're hoping if they can reprogram, get it back and do a full scan today, they could get more info. >> thank you very much. if you hear anything changing, let us know so we can get to you and find out the latest. let's bring in former faa inspector mr. david souse, to talk about the difficulties facing this new phase of the search. the bluefin-21, not up to the job, it's the wrong thing, it can't go deep enough. is that fair? >> you know, it really is. in the defense of that, there's no way to know exactly how deep it...

>> some of the mountains are beneath the sea. mr there's a plateau that has that kind of thing which is near to where they're working. >> is there a way to anticipate that? >> again, you start with a good base map and preliminary work and you work from there. you plan layer on layer getting progressively more detail over time. >> the next kind of topography and its challenges. the issue of trencheses or canyons under water. >> sure. >> that seems like that could be a real challenge for the bluefin-21. >> sure. >> what would it do? >> if the vehicle is tracking along watching ahead for obstacle...

With a steep wall, climb quickly because sometimes they're programmed to climb gently but get out of there. again, it's going to start with a very good base map and plan about how to attack that area. >> that just soms from pure analysis of what they have. >> and experience of the team, people analyzing it, that have worked here in this kind of terrain before will know how to do those things. >> let's move on to the last -- the third opgtion of topography. more of a rolling hill or a rolling bottom. >> sure. >> this is what angus houston says at one point he believes is the most likely here at...

Did this surprise you? >> well, that kind of thing happens. you try to be aware of that if you've got an accurate base map to begin with. >> which is our first problem, we don't have an accurate base map, right? >> if they've got one, we haven't seen it. when the floor takes the dive, so does the vehicle and the vehicle goes, oh, no, i'm not supposed to be here and punch it out. >> what did you learn from yesterday's search, the aborted search. it was only down there -- the whole trip was 7 1/2 hours. how do you adjust today? >> their tactics are going to be important, having looked at where e...