I typcially run a sub in 3rd person from a view behind it. I submerge it just before it goes into complete submerge view. Like this only a small bit of the periscope is above water. By doing this you are very hard to see. When I come across a battleship, I can usally sink the sucker w/6 torpedos before I am discovered or the battle ship can evade me. You can launch the torpedos from a long ways back and hit. Depending how the sub captain does it, quick work can be done to a ship from a sub.
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