radar. we're now hear that the bluefin-21 actually spent 7 1/2 hours in the water. officials say that it could take up to two months for it to search the entire area. chris? >> erin, thank you very much. let's bring in cnn aviation analyst and former inspector general for the u.s. department of transportation mary schiavo and cnn safety analyst, former faa inspector david soucie and author of that great book. >> "why planes crash." >> mary schiavo, you play the role of investors here for malaysia. how can you say that you don't pick up any cellphone information, it's not that hard to figure it out, and now weeks into the investigation you say you did? and it was the co-pilot's? how do you make this type of mistake? >> well, you make this type of mistake if, one, you're not on top of your investigation and, one hand doesn't know what the other hand is doing. and this piece of information a