How does sound travel long distances? The SOFAR Channel
A sound channel exists in the ocean that allows low-frequency sound to travel great distances. This channel is called the SOund Fixing And Ranging , or SOFAR, channel.
The following sections include information on how the sound channel was discovered and used over the years, how the sound channel is formed, how sound travels in it, and how the sound channel varies in different parts of the ocean.
History of the SOFAR Channel
Sound Speed Minimum
Sound Travel in the SOFAR Channel
Sound Channel Variability