Das Boot Sound Mod for SHIII? I did that, with the blessing of the original DBSM team, who created the original mod for SHII.
https://www.subsim.com/radioroom/dow...do=file&id=978
Here are a couple of fixes I did much later:
https://www.subsim.com/radioroom/dow...do=file&id=943
https://www.subsim.com/radioroom/dow...o=file&id=1528
https://www.subsim.com/radioroom/dow...o=file&id=2845
https://www.subsim.com/radioroom/dow...o=file&id=3070
There are also a bunch of great songs to be found in that 'Sound Mods' part of the SHIII downloads section.