You need to open up the subs .gr2 file in the goblin editor.
this is from a long time ago, haha I read it last week and didn't realize it was my own damn post telling me how to use the goblin editor!!
Quote:
Originally Posted by mobucks 
open the .gr2 file of sub
right click inside project tree
select Add File...
Select the .sim file of your sub
Look bottom of project tree for line NSS_UBoat7b.sim
double click line Unit_Submarine @ NSS_UBoat7B
under "existing behaviors"
under "render"
click "unit_submarine"
on the right window edit behavior
+unit ship
>+obj_hydro
>>+surfaced
>>>+draft
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Those directions might be out of date but that's the gist of it. You want to expand the "submerged" tree under "obj_Hydro" and change the value "draught" to something like 7.8 (the deepest the sub will go with you on the bridge)
After you make any changes right click on your sub's .sim file in the middle window pane and select save.
The PROPER way to do this without potentially pooping up your JGME install is to make your own modfolder and install it in the game that way. Making a modfolder and activating it is extremely easy so do it or search how to if you don't know.
You're the alpha tester, let us know how (if?) it works!