the gear you make, to your gear. you listen for the boxes. you look for the gear. i want to start with the pinging. i m not sure if i understand clearly, thomas, why it is that you can listen for two hours to pinging and, here we are 12 hours later, we haven t redetected it. the trajectory, how the boat is moving across the water, where it is close to that device that they heard or what they think they heard, is very important. it has to be close enough to hear it. miles make a big difference. it doesn t sound like a lot when we re on the ground but in the ocean, miles are very, very hard to line up. they re hard to line up but you would think today in this day and age with gps it s actually simple. it isn t? well, we re looking at something that could be a half a mile at the surface but much, much more at the base of the ocean. this 4,500 meters deep where they think this pinger might be.
objects of interest. if i could just ask our director to pop up camera two for us over here, because i have this very rudimentary piece of cardboard. just imagine a pizza for a moment. this will explain why we could have two hours of searching, the boat turns back around and only gets 15 minutes of pinging at that point. because it didn t make much sense to me. i m not sure if you can see the lines i ve drawn in here. thomas, you can help me. let s do it on camera one and then you can point this out. you can see the dot in the middle. this is a pizza floating on the ocean s surface. in the boat is going this way and crossing towards this pinger way deep down, it s getting louder as it gets close and it s getting softer as it gots away. if they re getting a two-hour long line, what would it be if they were farther away, would this be the 15 minute line? that s correct. if you think about it the range of the pinger is something on
different area, about 300 miles away. officials cannot confirm anything that has been heard over the last 48 hours is connected to this plane. want to dig into what this latest information can actually mean for the search. i m joined now by expeditions logistics specialists christine dennison. cnn s michael kay. and thomas alshiler, telemanager of bp design systems which designs and builds the black box pingers and also the pinger detectors. perhaps you can tell me what the job is now. now that we ve had these two very promising detections, marchly from the ocean shield, because it seems to be the longest, the two-hour ping followed by the 15-minute ping that had the echo. what s the job now for the ocean shield? what are they trying to do? they re trying to do kind of cover the area and narrow where they thing the ping s coming from. they need to shrink the box they re going to look in when they put the vehicle down.