[Dr.Sid]

Here is little something about DW sound model:

http://www.subsim.com/radioroom/showthread.php?t=117814

There are some other interesting threads about the topic:

http://www.subsim.com/radioroom/showthread.php?t=142464
http://www.subsim.com/radioroom/showthread.php?t=131080
http://www.subsim.com/radioroom/showthread.php?t=131383

Here is link to sound propagation ray-tracing based tool I made:

http://roger.questions.cz/other/SoPro.1.9.zip

Here is some documentation to it:

http://subsim.questions.cz/sopro/doc/sopro.html

I'm no underwater sound pro, so I post this to get some feedback too.