CNN CNN Newsroom March 20, 2014 19:52:00
Job. the people with lights are looking out into the water. that's a difficult, difficult job. the planes flying over have to deal with the same thing especially since the images are somewhat beneath the water. when you talk about going beneath the surfaces, when you talk about a ping from the signal, it may be coming up somewhere but the distance from the bottom to the surface may eat up all of the layers of the pings. simple truth is, the pinger helps you when you're already on top of it, when you've closed in so closely that you're within one to two miles. then the pinger might help you if ...
Source: archive.org