Go here:
http://u-boot.realsimulation.com/
its in the SH3 downloads, In the audio section.
Its called
AnzacmickSoundModV1b.rar
Theres two of them.. A and B.
AnzacmickSoundModV1a.rar, replaces some of the Ingame sounds that are formatted in .wav. (IE creaks, growns, flooding, etc.). Personnaly i choose not to use this part of the mod, as i have another more comprehensive sound mod installed.
AnzacmickSoundModV1b.rar replaces some of the crew voices.
I selectively used a few files from here, and left a few ones out as i thought it broke my own sense of continuity. (IE cheif would say a depth count in his own voice, then his voice would suddenly change when he said "meters" because of the replacement file. stuff like this i left out )
Follow the directions of the readme, but realize you may have to create more sound directores.
What i mean is, theres 9 directores where the sound mod installs. Each directory represents a different voice. The mod only installs to directory 1, but if your crewmember used voice 2, you wont hear it.. so i had to copy the files to all 9 directories (using JSGME of course).