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That's the bow of the "titanic" here. it broke in half. this is the stern of the "titanic." six football fields away. all of this is a debris field. this is the kind of thing when you look at an aircraft on the bottom, all of these things are everything from pieces of pottery and lights. >> all of this. >> all of these speckles and bigger pieces inside of here. >> so the "titanic" had a wide debris field. >> stern especially. the bow not so much. the "titanic" had a huge debris field associated with it. >> zooming in on the bow. it shows how powerful sonar can be. >> incredible. >> this is one...
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It's only there to take sonar pictures. the next step is to send down other submersibles that can do more. gary tuchman got an upclose 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 reis semables 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 170 days a yea...