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Lot more fuel than you would at cruise altitude. the difference you would recover is going to be very different than you would at cruise altitude. >> this is for tom, from michael, the last communication from mh-370 was spoken by the pilot. were all previous communication from him as well? >> we don't know that. >> why don't they tell us? >> i don't know why. most people say it really doesn't make a difference. the captain runs the ship. he could have said to the co-pilot, why don't you take off, i'll handle the radio. he had just been approved by his check pilot, essentially promoted into the...

Area hamper images of debris? >> it could. it's going to -- it could be very challenging for smaller pieces. and the remote vehicle has to be very careful in deep silt. because even the slightest bit of propulsion from it can stir up the silt. it's going to be a painstaking task once they identify the wreckage and once they start to get into it. it's >> this question is a good one for you. what would the passengers have seen at 4,000 feet at 1:00 a.m. would they have any idea the flight went that low? >> depending on the time of day that it would have been at 4,000 feet. 1:00 in the morning? t...

Has shrunk dramatically. and it is so much smaller than it was, just a matter of days ago. whether it is a few kilometers or whether it is 20 or 30 square kilometers or even more, no real certainty on that. certainly with those four ping, and also the arrival there of that british naval ship, the "hms echo," which can look at the bottom of the ocean as well and send out its own ping, down to the surface, to see if there's any wreckage down there. there's optimism here they will find the wreckage. the complicater is this silt we have discussed in the past on the bottom of the ocean floor, which...

Soon. >> we've heard a lot about sensitive information, secret information that may be helping that they don't want to discuss for reasons that it could undermine u.s. sources and methods or other country's sources and methods. it wasn't just blind luck that they heard those pings. you buy that? >> from the very beginning, i think we were always questioning whether or not there were extra resources in there. and assets that they didn't want to disclose for that very reason. >> yes, makes sense to me. what about you? >> yes it does, i mean, i think we had assets there that were classified. it's...

Didn't sink in the silt -- >> if the pinger battery is dead what good is that? >> well, mean, if the pinger was on the surface, at the bottom, i should say, of the silt, and give a signal, then maybe the box was sitting on top of the silt as opposed to in the silt. >> eight men and women are taxed with solving one of the greatest mysteries in modern aviation. what specialists on board the australian ship, what they're up against in this around the clock hunt for flight 370. and the health and human services secretary resigns. the director of office of management and budget steps up to the pl...