Captain, in this case I don't think it's a matter of liking the sounds or not. As Mister_Spok mentioned, some sounds (such as the dive/surface sequences) will only play once per game session - in order to hear them again, you'll have to exit/enter the game again. If I'm not mistaken, there's a trigger in sh.sdl that defines whether a sound will play once or every time it's called on. I also seem to remember that sound files longer than 15 seconds would only play once, no matter the settings in sh.sdl (unless it's set to Loop), and that's a core game limitation. Then again, odds are I'm talking out of my tail pipe since the last time I was reading about the way sounds work in SH4 was three years ago, so please feel free to correct me
ETA: upon checking the sh.sdl files of TMaru and OTC, and the relevant sound files, it seems I was wrong about the trigger within the file but right about the duration. None of the sound files in TMaru exceeds 15 seconds, whereas the same files in OTC are much longer. I can't remember what I had for breakfast this morning, but I remembered that tidbit of info regarding sound duration and how the game handles them. Go figure...
