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That could be from the jet's black boxes. two sounds were heard in the indian ocean lasting just five minutes and then seven minutes. the signals were weaker than they had been. that's a possible sign that the batteries on those flight recorders are starting to run out. let's bring in jeffny thomas, an aviation expert and editor in chief of airlines ratings.com. he joins us from perth via skype. the question we have here, it seems like an incredible stroke of luck that they were able to hear these pings in the first place over the weekend at that location. now they've heard them again. do you ...

They're sure the batteries powering the black box pingers are dead. >> i believe we're searching in the right area but we need to visually identify aircraft wreckage before we confirm with certainty that this is the final resting place of mh370. >> reporter: planes have been scouting for debris most every day. cnn was on board a new zealand air force p3 owe ryan as it flew. >> none of the sea craft has -- >> reporter: now, wolf, as for if they are the flight recorders or one of them, the air chief marshall, angus houston heading the search, says wreckage needs to be identified before they are ...

Ship has again heard signals, signals that could be from the jet's black boxes. two sounds were heard in the indian ocean lasting just five and seven minutes. and the signals were weaker than they had been. that's a possible sign the batteries on those flight recorders are starting to run out. still, officials hopeful. they are hopeful this will finally point them toward the jet that's now been missing for 33 days. meantime, protesters in eastern ukraine are not backing down. they have taken over government buildings in donetsk and elsewhere saying they deserve a vote so they can break away ...

The faint underwater signals heard over the weekend. today the search area for malaysian airlines flight 370 has been drastically scaled back. that red box you see is today's focus, dwarfed by the sprawling gray areas earlier searched by sea and air. one expert says the search area has shrunk to the size of texas to merely the size of the city of houston. still a big area, though, right? with the batteries on the flight recorders either dead or dying, search efforts are holding nothing back. cnn's will ripley isality the hub of tthe -- is at the hub of the search in perth, australia. good morn...

They were there, then they weren't. those crucial signals picked up in the indian ocean consistent with pings from the flight recorders. no one is following this more intensely than the team at phoenix international, which designed the device which heard those sounds. >> do you think that even though they haven't picked up anything for a couple of days that the pinger locator could still pick up pings? >> i believe so. based on my experience, i believe so. we did a job a few years back and heard the pinger for up to 58 days. >> tonight, it continues off the ship "ocean shield" with the pinger ...