the tail. they're made of composite carbon material that can make them float for quite some time particularly this piece we've been talking about, the flaperon. that's hollow inside. so it can float. also you might have things in the baggage hold that have been put there that would float if it were ripped open. when you move into the cabin it can become more pronounced. think about the planes you've been on where people have said the seat bottom cushions will be float or can be used for flotation twices. that's one possibility. you have all of the things people bring on board planes whether it's a toiletry kit or water bottle or packet of chips or cookies, anything capturing enough air to make it float can go to the surface and float for a very long time wolf. think about this, a plane like this is 300,000 plus pounds empty. at takeoff it can be quite that much. so that's a lot of material to consider. >> which part of the plane are unlikely to be float or pushed around by currents? >> well there are some of those and they're really important