CNN CNN Newsroom March 25, 2014 19:04:00
Ocean. you use a hydrophone just like you would a microphone to be able to listen to it under water. >> this has to be how close to that ping? >> about five miles. >> so that's a widespread area you're talking about. so that's the hydrophone. this is what you start with when you still have the ping for a few more days. the other option is the sonar, what they would go to second. and these are two options that are sonar examples. >> right. the hydro is listening for the ping. this going to emit sound that's going to reflect off the sea floor. going to use it to form images of what's on the bott...
Source: archive.org