weekend. time is running out for the pings from the black boxes. there is willsalso a british sut will be reaching out. what can they do without debris on the surface? >> very, very little. even if we had debris on the surface. it would be some hundreds of miles from potential impact site. so they need to be practically on top of any wreckage on the sea floor, which is not going to be related to wreckage on the sea surface in order to get ahead. you would have to be a desperate optimist to claim this is going to be any good. the chances of having it out there are a lot better than having it tied up on a wharf in perth. >> we know these situations are very different. colleen, to that end, we know in that situation, the pinger ran out of batteries as well. what if we get past that point? we are now getting really close to the life of the batteries