Here is a tutorial on how to sink a contact by using passive hydrophones only.
http://rapidshare.de/files/38491800/...oHunt.exe.html
(it's an 123MB EXE because the format is from the Bink compressor and the player is included. In best WMV the file would be over 300 MB! To pause the tutorial press spacebar!)
Here is a thread to get you running - over at Ubi - I can't find it here...
http://forums.ubi.com/eve/forums/a/t...945#8301008945