>> now the australian transportation safety board is searching again, with chief commissioner martin dolandarge. >> we have very good techniques for detecting needles in those haystacks. we have high confidence that if we have the right haystack, we'll find the needle in it. >> friends and family members can only hope that's true. >> it's easy to forget the plight of these families. you can imagine the roller coaster of emotions that goes along with this. you go through all the stages that you go through, including denial, wondering if it happened at all. in this case, there's no wreckage. so you can imagine how people would say maybe they are alive somewhere. and how much would that add to your torment. >> doland believes he has the tools to find the answers. >> this is no easy task, but we think we have the best vessels and the best crews to carry it out. >> and experts have continued to refine a search area. but that doesn't mean it's easy to reach. >> it's six days sailing out from the coast of australia, and so, again, we have some challenges. we're operation in the range of the equipm