Yes, I think I found the problem of crash of the game : delete the
"gar class submarine" and after, normally it will work.
In fact, It was very easy to build this mod!
I do this tutorial in case the mod is do not work.
I would advise you to keep the single missions and I explain how I did this mod :
Instructions to build this mod :
-take the original submarine folder of your game (for example the gato class) and copy it in a new folder (I suggest to keep your new folder on your desktop).
http://www.mediafire.com/view/62iiai...2iiaiwjajtyp1g
http://www.mediafire.com/view/62iiai...q399ewgedsy8wy
-Open .sim file and delete "human sub"
http://www.mediafire.com/view/62iiai...kxr6g3hsb0vonp
-Create the new node to make the submarine movable
http://www.mediafire.com/view/62iiai...888fcaijfbn6n8
http://www.mediafire.com/view/62iiai...uomgzukolab358
rename it : "cmdr_AIShip"
http://www.mediafire.com/view/62iiai...tb191zcne097tc
-Copy the parent id of unit submarine
http://www.mediafire.com/view/62iiai...zn2hynk2ocox77
-Past it on the parent id of al ship
http://www.mediafire.com/view/62iiai...d0446o45txrh22
-Now, I strongly recommended to change the value of .zon file "crash depht" to
8 because if you not do that, the submarine can not sink !
http://www.mediafire.com/view/62iiai...u95o9l9j90ecgu
This mod don't need any instructions because you just put the folders on your "MODS" folder. Simple no ?
Tell me if it's work or not... If it's do not work, i think I can help you.
Good hunting !!