It's a very easy to do process, just need to tweak the grannyCaustic controler that applies to each hulls under the goblin editor (that's in *.sim files). Be warned though that many mods already modifies this particular files so prepare to face compatibility issues amongst users.
Other than than, it's a minute process for each subs to get it to your own liking. You can tweak intensity, at wich height regarding the hull it start to fade off, the speed of the animation, at which depth when submerged it will completely disappear. And you can view everything (except altitude submerged) under goblin in real time.
I could do that, but you can on your own I believe, really, it's quite easy to figure out. Ask me if you want some detailed help, don't know your modding skills...
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