I tried with a decreased pitch of the sound but didn't like it. Like Hitman said, it is a cutoff from the unedited original sound file.
I did it for my own pleasure at the beginning, but found it suits well into the game so i wanted to share it with other Submarine-simmers.
I will try to get other soundfiles from
www.hnsa.org into the game - it's a great site.
Tell