or you can only search as fast as you can search in. >> what it does is after that pinger stops, now you've got to search -- your area of which you have to search, the grid has to be much less. you have to physically see the box now as opposed to being within a mile or two of the box and to get the pinger. now your grid of scanning and examining the floor has to be much much smaller. >> right. thank you all so much. appreciate your insight and all your work these many hours on cnn. coming up next, reports of the families of flight 370 being forced to leave their hotel in kuala lumpur. we'll tell you why when we come back. what does everything mean to you? with the quicksilver cash back card from capital one, it means unlimited 1.5% cash back on everything you purchase, every day. it doesn't mean, "everything... as long as you buy it at the gas station." it doesn't mean, "everything... until you hit your cash back limit." it means earn 1.5% cash back