Hmmm... don't know. I know IuB includes a better 'blow ballast' sound, but I agree the surfacing sound is rather subdued. But I don't recall any sound pack addressing this issue.
You could try searching incognito's sound pack for it, that's the only really complete one I know.
Also, apologies in advance for any bugs in the IuB beta - I should be able to release a new version in a couple of days.
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