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Transcripts for CNN CNN Special Report 20140416 06:18:00

Atlantic s harbor branch oceanographic institution. all right. ready to go. ready to go. reporter: but other manned sea vehicles may be next to line to aid in the malaysia airlines search. if this or another submersible can get where the wreckage is, how effective do you think this could be? very effective. reporter: this is the view of the submersible in the atlantic ocean. it can go 3,000 feet deep. but like all research sub, it s slow. it only travels just one mile per hour when searching. the sub was called to duty in 1986 after the space shuttle challenger exploded. and it recovered some of the wreckage from the ill-fated shuttle. we have the capability of lifting around 1,000 pounds of weight to the surface. reporter: in the very front of the submersible a tool called a manipulator which does the important work of grabbing, scooping and sucking up samples that are recovered. this sub is about 24 feet long. ....

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Transcripts for CNN CNN Special Report 20140416 06:19:00

It is also about 11 feet tall and it weighs about 28,000 pounds. it has enough oxygen and emergency provisions on board for the people to survive underwater for up to five days. there s also a bat cabin on the submersible called the aft observation chamber. a crew member who keeps an eye on the submersible s vital signs and another scientist share that back area which is only 5 1/2 by 3 feet. so, just to give our viewers an idea how tight it is, this is how you are sitting. this is how i m sitting and you can be here for hours. but during those hours this is what is taking place. so we fire up the sonar system. and it does a sweep and it paints us a picture as it spins 360 degrees. if there are solid targets on the bottom, it will beep and it will kind of paint a small picture of what it looks like and we can motor that way. reporter: the use of high-tech underwater manned vehicles is increasing but ....

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Transcripts for CNN CNN Special Report 20140416 06:17:00

A digital camera who has done a panoramic view knows how hard that can be to get everything just right so it s not easy to do this but there it is. incredible. the technology is just amazing. david gallo, thank you so much. for all the bluefin-21 can learn it s only there to take sonar pictures. the next step is when debaris is found to send down other submersibles that can do more. gary tuchman got an up-close look at one vehicle that played a key role in finding pieces of space shuttle challenger. here s what he saw. reporter: at first glance it resembles a spacecraft more than anything else but this is a research sub that has combed the seas doing everything from medical research to ship and aircraft recovery. we have an array of light systems on the sub. so you can turn on whichever light you need. reporter: jimmy nelson used to spend about 170 days a year on the sub. the johnson sea link submersible as it s known. it s now retired at florida ....

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Transcripts for CNN CNN Special Report 20140416 06:20:00

Jimmy nelson says when looking for wreckage, manned submersibles offer important dimension. sometimes having a human being can spot things an unmanned submersible cannot spot. correct. reporter: this could be sent in to action underwater in an effort to solve a mystery. gary tuchman, cnn, fort pierce, florida. incredible technology. for more on the story and others go to cnn.com. coming up, could a new system for tracking planes with gps and satellites prevent this type of situation from happening again? and the question is, if so, why isn t it being implemented right now? also, life-saving lessons from other deadly crashes over the years. how investigators make sure the saddest moments in aviation history never happen again. and later tonight, breaking news, a cnn exclusive a new al qaeda video is surfacing. a top leader meeting with more than 100 followers. we will tell you why it is so important and who was involved, ....

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