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Now an american underwater drone is being called in to assist with the search. it will not be easy. the waters where these signals were detected are 2.8 miles deep. all right, after a long break, the oscar pistorius murder trial under way again. the blade runners defense beginning its case this morning by calling a forensic pathologist to the stand. pistorius is expected to testify. cnn legal analyst kelly phelps live from pretoria, south africa, this morning. kelly, any indication when he mig...

Some wreckage. but they warn, and this is one reason for caution, that the depth there is 2.8 miles. so the vehicle thats being carried by the australian ship will be working right at its limits. now, at the same time, another reason for caution, yet to find any wreckage at all in that area. the search coordinator saying if only we can find some wreckage, it will help determine whether the plane did come down. at the same time, the battery in the black boxes is fast reaching the end of its life,...

>> reporter: well, if theyre able to find that third acoustic event and actually deploy this underwater autonomous vehicle that they have, depth certainly a factor. houston in that press conference saying that 2.8 miles down is at the very limits of the capabilities of this autonomous vehicle, and if for some reason it doesnt work, theyll have to bring more assets capable of handling that kind of depth, and of course, that will take more time. christine? >> more time. all right, erin mclaughlin ...

Have taken before this plane vanished and how the families of those on board are now dealing with this breaking news. good morning, everyone. good to see you. welcome to "early start." im john berman. >> and im christine romans. its monday, april 7th. it is 4:00 a.m. in the east. lets begin and welcome all of our viewers here in the u.s. and around the world beginning with this breaking news. up first, the most promising lead yet in the search for flight 370. overnight, a u.s. pinger locator pic...

Force as air chief angus houston, well, he says until they have evidence, they cannot be sure that it is a plane. take a listen. >> i need to be honest with you. it could take some days before the information is available to establish whether these detections can be confirmed as being from mh 370. in very deep oceanic water, nothing happens fast. >> and when he says deep in the water, he means really deep, 2.8 miles, almost 3 miles into the water. a u.s. underwater drone, the bluefin is now bein...

Welcome back to cnns breaking news coverage of the search for flight 370. officials are calling this their most promising lead yet. two separate signals consistent with black box frequencies detected overnight by a u.s. navy pinger locator being towed by an australian ship. now, an underwater, american underwater drone, now being called in to assist with this search. these waters 2.8 miles deep. again, all of this developing over the past few hours. >> well get back to that news in a moment. fir...

Dealing with all of this new information. good morning. welcome to "early start." im christine romans. >> and im john berman. it is monday, april 7th, 5:00 a.m. in the east. we welcome our viewers here in the united states and around the world, and we do begin with the breaking news, whats being called the most promising lead yet in the search for flight 370. i think this came as a surprise to a lot of people. overnight it was announced that a u.s. pinger locator has detected two separate signal...

Welcome back to cnns breaking news coverage of the search for flight 370. officials now calling this their most promising lead yet. two separate signals consistent with black box frequencies detected overnight by a u.s. navy pinger locator being towed by an australian ship. this news developing just the past few hours. an american underwater drone now being called in to assist with the search in waters that are 2.8 miles deep. >> well get to this search in just a few minutes. first, some news ...

By an australian ship. an american underwater drone now being called in to assist with this search in waters, john berman, that are 2.8 miles deep. >> yeah, not a lot of people have been to this part of the ocean. >> wow. >> its very, very remote, about 1,000 miles off the coast of perth, australia. this is where the analysts now believe that flight 370 may have ended. and as i said, the conditions there are simply treacherous. >> our next guest knows this region well. eric rays is an oceanograp...

By a long cable in the case of 4,000 meters depth, you would have a cable 10,000 meters long towed from a ship between 190 feet and 250 feet. and weather-wise, ive seen those devices deep-towed sonars recovered in 30-foot wave, 30-foot seas. >> and obviously the ships can handle that as well. so the waves are not -- for these big ships that would be towing the underwater device, the weathers not a particularly threatening thing. >> you might have to pick your course to go in a certain direction ...