if if so what will they learn? david, thanks for being here. great to see you. let's look at the piece that investigators are analyzing. tell us what's happening at this hour. >> the first thing is as an investigator is to shake off everything you know about mh 370. forget about everything you know. you are going to let this part tell the story. every part in fact accident has a story to tell. >> how do we do that? >> as we look at it visually you can see a couple interesting things about this. we talked a lot about the barnacles. they are strategically put there. they grow here and here and here. along the back are the barnacles. why are they here and not here? >> i don't know why? >> this is a zinc paint. this is a paint that is apoxy. it's designed to keep microbes and algae from growing.