is to scan the ocean floor. to do that you use sonar or sound acoustics to provide imagery of the sea floor. then once you've gained imagery of the sea floor you can use that to actually locate the wreck. you would see it clearly outlined on the sea floor. then you can deploy either a robot or a manned vehicle to go down and take pictures and investigate. >> this kind of technology we're looking at right now can go to extraordinary depths. the bluefin, i'm not so sure. is it possible for that submirrorsable to go down three miles if need be? >> that's a question for the manufacturer and i know that he's looking at that because of course bluefin is operating at the very edge of her operating range, but there are some engineering factors in there and