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Mean, if we find the debris field, this is it. and it's 500 miles. it's 500 miles this is incorrect assumption that that black box is probably back 500 miles? that's not going to float? and so it's going to have a different drag along the ocean floor? >> it doesn't float it goes straight down. where we find a debris tell tell. look back up the track to find where the aircraft hit the water. the black box will be more or less right underneath that impact point. >> is there any sort of sufficient current to drag that black box any place beyond where it's sunk? is there any movement at the ocean ...

Where -- a short time ago i spoke with an ocean engineering consultant, who played a lead role in finding the air france wreckage. >> reporter: let's start with the basics here. when do they start this search and where do they start this search at the bottom of the ocean? >> that's a great question and it's kind of difficult to answer. really the search for looking for underwater doesn't really begin until, you nope, they can accurately and positively identify debris on the surface. and once they do that and start to pick up that debris on the surface and map out where they're getting it day b...