Let me finish it it and I'll upload a copy, but I wouldn't call it a mod as I've just taken sounds from Pouls, Row, some of Steves and Lare and added my some I've found on the net. I guess it would be OK, have to check to make sure I ain't stepping on someones toes.
I posted this link, but from the Caiman, someone recorded sounds. A 60s sub, but some good stuff. Some of it's just fun, like hearing men cussing over the interference coming from the movie..The other one amazing to listen to is where they try to surface in rough seas, one is "close the hatch quick" They decided to surface, stormy and after cracking the hatch, decided to slam it and go to snorkel, then the snorkel is full of water...good stuff. I did use a few of the others that made sense.
http://www.flamincaiman.org/gallery/sounds.php