this is something that SH3 users screw themselves into...
when switching from conning tower or any outside view, to any map or inside view make sure you do so at 1X time compression.
the easiest fix i have found is to...
1. surface at least 50 KM from any shore, port or known surface or air units.
2. Save the game
3. exit SH3
4. start SH3 and load your savegame
the sounds should be normalized.
good luck hope this works
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