finding it is the navy s bluefin 21. it s going down for a fifth mission. any moment we re going to be getting the results of the fourth. that should break any moment, as i said. i ll be bringing that to you when it crosses. so far it has searched 46 square miles and has not found anything. the question tonight is there a better way to search. we re going to take a close look at another underwater vehicle that has frankly, better capabilities than the bluefin. it actually found air france flight 447 at the bottom of the atlantic. so why isn t it being used tonight? and we re going to go live underwater inside a submersible, just to give you saefnlts we taa sense. we talked about the pressure and how cold and terrifying it is down there. our david mattingly is inside a submersible. he is now in the process of making his descent. you re looking at that as it s going down to the bottom of horseshoe bay in vancouver. we re going to go live to david in just a few moments when we gets to the