and that overheated. it caused a fire. it caused a fire which brought smoke into the cockpit. they knew about it. they tried to divert. they tried to get to canada. and they came quite close. but this was as a result of just sheer overwhelming of the smoke. >> and speaking of batteries, 16 days left or so of juice in the black box. does that intensify things for people? 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 dr -- 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