Deep sound channel?

Question

Has anyone heard of something called the "deep sound channel". The way I understand it it's a deep layer in the ocean where the pressure is so great that it confines sound waves and can be used to send messages to other areas of the oceans and is used by the Navy for long distance communications.

Answer 1

Deep Sound Channel (or Sofar Channel)
Sound Travel in the SOFAR Channel
In the deep ocean at mid-latitudes, the slowest sound speed occurs at a depth of about 800 to 1000 meters. This is called the sound speed minimum. The sound speed minimum creates a sound channel in which sound waves can travel long distances. Sound is focused in the sound channel because the sound waves are continually bent, or refracted, towards the region of lower sound speed. Sound that travels upward from a source at the sound speed minimum is bent back towards the minimum. Similarly, sound that travels down from the source is bent back up toward the minimum.

The following figure has two parts. On the left is a plot of sound speed as a function of depth. The sound speed minimum at a depth of 1000 meters is called the deep sound channel or, more historically, the SOFAR channel. SOFAR stands for SOund Fixing And Ranging. On the right are the paths followed by sound waves as they travel away from the source. These waves are continually refracted toward the sound speed minimum.

nfd

Answer 2

No I've never heard of it, But it sound's interesting.

Answer 3

hey u aswered my wacha ma call it querstion
im not straight >.<
im bi and the thing recomended to put it there