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Pinger, the signal coming from the black boxes contain pg the flight recorders. these beacons are designed to be activated if they send extreme deceleration or impact. experts say there are other possible scenarios with the missing plane where the elts would not have worked. >> if the plane crashed with too much velocity into the surface so that the entire plane is disintegrated also if the plane lands gently enough for instance if the plane is set down gent ri enough that there wasn't sufficient g force to activate the elts. >> other reasons why the beacons wouldn't have worked. a crash could...

Break and re-evaluate. i think they're still focused on those pings. they believe, as i do, that those pings came from the black boxes. >> bill, what about you? i'm wondering, we got word this morning that the bluefin was slowing down today. are we running that thing into the ground. >> well, i think it's getting tired. there's a lot of effort been expended with that vehicle and it probably needs some maintenance and i think the decision to change platforms and change location is a sound one. hopefully -- i agree with david. there's nothing else down there that those pings could have come from...

Confidence that they can go forward, even if the malaysian resources run thin. >> after hearing the acoustic signals, the pinger, he believed it was from the missing plane. what is your take on the fact nothing, nothing has been found? >> it seems extraordinary there's no floating debris given the assets to search in the area. but, the fact they perceived a beacon, which is almost certainly from one of the two recorders, if not both of them, it would have to be fairly close to there. these are very short range, only 9 kilometers or six miles. i expect they will find something in the short term...

Transmitters on board the missing many. they are supposed to send locators out on impact. not one burst was sent from flight 370. could the possible reasons why these didn't work lead us closer to finding out what happened? it's one of the most baffling questions in an already con founding mystery. why didn't any emergency beacons send a distressed signal? they are called elts. and a senior aviation source tells cnn there were four of them on the plane. >> emergency locator transmitter is a small radio transmitter that sends a signal detected by satellites in the event of an airplane crash. >>...

Domestic audience but also now to garner support in russias near abroad. diana magnay, cnn, moscow. a new coin is being minted in russia to commemorate the annexation of crimea. >> it tafeatures the face of vladimir putin on one side. flip it over, the outline of the crimean peninsula. >> it's rather large weighing in at 2 pounds or 1 kilogram. some forensic experts are convinced the disappearance of flight 370 is a crime. the problem right now, of course, is the lack of any evidence. >> there has been no evidence, but what if the plane's debris and the flight recorders are ever found? mig...