Hello mate,
The best thing I did was to download Thomsen's excellent sound pack for SH3 and replaced the amb_submarine interior sounds. Now there's joking, muttering and a bit of cursing in the background when you're mapreading etc. The environment feels much more alive. There's an 'Alarm!' in there too - taken from Das Boot but I found it hard to get it to work on crash dive. It's on surface to periscope depth though.
Good luck.
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