I'm not all that familiar with the audio files and those particular mods but I sometimes get that when I'm in the middle of something like a battle or doing something else that might stop the audio from playing when you surface or dive.
Not sure if that helps or if I've completely gotten it wrong but that is my opinion on the matter with my experiences.
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"A good Navy is not a provocation to war. It is the surest guaranty of peace."
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