CNN CNN Special Report April 16, 2014 03:20:00
A crew member who keeps an eye on the vital signs and soot scientist share the 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. >> reporter: but during those hours this is what is taking place. >> so we fire up the sonar system. it does a sweep and paints us a picture as it spins 360 degrees. if there are solid targets on the bottom it will beep and paint a small picture of what it looks like and we can motor that way. >> the use of high-tech underwater manned v...