CNN Wolf March 25, 2014 17:42:00
Readout of what the hydrophone is listening to right now. all we really see is random ocean noise. if there was the beacon out there, you would see all of a sudden a strong spike at the 30 to 40 kilohertz range, the frequency that beacon is emitting. and a strong spike coming in once a second, and that's where you know you're within range. >> reporter: so how deep is the water here? >> here we are only at 40 feet deep. >> reporter: but just to give an idea. if you look on this side over here, it's showing you what's on the bottom of the floor right here of the water. >> exactly. so this is the...
Source: archive.org