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Weaker and weaker and the tone which we have been playing on air here goes just a little more dimmer and dimmer. so, they're really racing against time to try to make sure that they try to find some debris and perhaps find these before these pingers go silent in the next two weeks or just a little longer. now you might remember in 2009 in the crash of air france, they were able to spot some debris. they didn't find the black boxes immediately and the battery did die, but at least they found the debris and they knew the general area where to look. >> you know, let's talk about some of the thing...

Th is a very small town. you know, it's been cut off because of this debris. jennifer gray can tell us more about the landslide conditions and why this happened. but the urgent matter is really the people that are still stuck under the debris, guys. look at the dramatic images coming out. >> this video came from a guy that was just driving on the 530 that goes by this town and through it and just came upon this and just pulled out his cell phone video and then unbelievable what we're seeing here. you mentioned, jennifer gray, let's go to jennifer and she can explain what happened and what led ...

U.s. will provide the underwater listening devices that help detect a plane's ping, as you heard there. help us under, would these hydrophones be useful if you don't have a specific debris field yet? >> well, no, it's very difficult because, as you mentioned, it's about two miles is about your limit. one to three, if you will, for the listening. when they zero in or narrow down, rather, the debris field so they can then calculate what the winds and waves have done to the debris and take it back to the likely point of impact, that's the area they need to be listening for these pings and the bla...

Released the satellite image that could belong to the missing flight. could be debris, but they just described it as suspicious floating objects. so, how could we go about figuring out if these small, grainy pictures are, in fact, leads. or how can investigators do that? here's renee marsh. >> reporter: some experts say the 74-foot object in this newly released satellite image from china is too big to be debris from the missing jet. others say we could be looking at multiple pieces. >> intermingled with wire and other debris, you may have a lot of smaller pieces mixed in, which might look like...

Piece on cnn.com in which experts and even the japanese officials say that after the 2011 tsunami, 10 million tons of debris was washed into the ocean. so, when we say that they found some items, a wooden pallet that could have come from anywhere. have we really found any clue anywhere? >> we don't have anything because you don't really have a clue from the plane until you pull it up on to a ship or a boat and determine that it really is from the plane. so, until then, all you have are sightings. but the best they have to go on are these satellite returns which put the plane in that area. and,...