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Surface based on any of the models predicted for the currents. where's the debris? i suspect most is at the bottom of the ocean. >> day 38 now. seems to be frustrating and searchers have to come up with a new plan. hoping to find debris. but is this also predicated on the fact there's no pinger sounds in five days and so this really is the only recourse to continue to search or widen the search on the surface? >> fredericka, i think you have hit it on the head. they might as well keep looking for the surface, floating debris. i said i'm not sure there ever was any. depends on how the airplane ...

The word -- confident, p beyond cautious optimism. he is putting a brave face on what investigators learned so far? searchers learned or is there real reason for confidence based on the pings they detected? >> i don't think there is my other plausible explanation what those noises would be. some scientists use these devices, put them on animals and so forth to track them. if a scientist had left a pinger there that was ping that way and hadn't raised their hand by now to say it was his or her project, shame on them. i would -- we are going to assume that is not in the mix here and those are pi...

He's turning the scientific mission into a movie. >> it's that need to see what's there beyond the edge of your lights. to see the unknown for yourself. >> reporter: the pressure at nearly 15,000 feet is crushing and very few manned submarines can with it stand it. >> only a half a dozen subs that can go to basically half the ocean depth with a number of countries having that capability. it gets to the point of, of collapse. it basically implodes. it just crushes. >> reporter: finding the plane is daunting. bringing it back from the deep, even more difficult. ed lavandera, cnn. >> difficult ma...

Is all happening around the clock. as far as we know there's been no debris or suspected debris picked up and analyzed recently. but talk to us about when we may see this next phase, when they be deploy that underwater vehicle to possibly go towards where these pings are coming from. we know the batteries last for 30 days. in some cases the batteries have lastest longer, could we see this phase begin in the next few days? >> reporter: it's possible, yeah. tomorrow will mark one full week since we've gone past the time that the batteries were rated for 30 days. it will be day 37 tomorrow. and s...

The one flying the aircraft. then the captain is catching all of the radio signals. >> thanks. that's insightful. colonel christensen, thanks. kissing congress member on the ropes apologizing for his actions. and the man who made the pinger of flight 370 joins me. does he believe the black box discovery is at hand? at od, whatever business you're in, that's the business we're in. with premium service like one of the best on-time delivery records and a low claims ratio, we do whatever it takes to make your business our business. od. helping the world keep promises.