vessel which helped them test their vessel. but you're not supposed to put it on the boat when do you a real search because you could end up hearing yourself. just looking at it sharing the iphone buds and the pole, given the relative sophistication we have to defer to the ocean shield. >> we'll take a quick break. we'll have more. how much longer can the pingers last? we'll go straight to the source on that. >> as soon as it hits the water it starts pinging. it's designed that way. >> also ahead i want to take you back into the simulator to explore this idea the 777 was on a course to deliberately avoid radar coverage. does that automatically mean that there was a human at the controls of this plane? we'll be right back. peace of mind is important when you're running a successful business.