SilentHunterIII\data\sound\Speech\ (or SilentHunterIII\data\sound\Speech_En\ folder if you want it in English).
There is nine folders for different voices, and in each of these folder there is three voicefiles for each of the speeches (normal, stressed, whispered), so you have decide which one you want.
Easiest is to use search for files that has either "yes_sir" or "torpedo" in the name.
I hope that helps.
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