A small eye candy mod that pretty much does what it says on the tin by adding ambient occlusion lightmaps to the external parts of the sub.
This is the same method used in the subs interiors to add shadows. See the images below for the difference...
This is also the method sh4 and 5 use to add ambient shadowing to sub exteriors.
BEFORE:
AFTER:
Still have to go through all the dats and add to the hull and the rest of the conning tower models.