the missing malaysian airliner. it is unlikely they are parts of the plane. we have the latest. >> reporter: a beach goer found a piece of sheet metal three and a half hours south of perth, australia. they don't have concrete evidence as to what happened to the plane. only clues. the four sets of pings the ocean shield heard. but they are ten missions in and unable to find anything of the plane. by the end of this week, it should be finished mapping out the area around the strongest signal, ping number two. after that, move on to more sophisticated technology. particularly the u.s. navy's orion submarine. but for all of the technology, this is just an educated guess. a series of mathematical equations and trial and error that have led them to this point.