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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