meters above the seafloor. now, one condition that causes it to abort its dive is if it reaches its maximum operating depth of 4,500 meters, that's what happened in this case. >> the limited data from the unmanned sub has been analyzed, and nothing found. as for the question mark over who exactly handles those black boxes when and if they are found, malaysia is now promising to share any information that is retrieved from those black boxes. but they say custody isn't actually that important. >> i don't think it's important who gets custody as far as i'm concerned. and this is my own personal position. it's finding out the truth. and we want to find out the truth. definitely we have to see what's in the box. >> what exactly does all of this mean as we go forward? let's go to the experts.