Heavy seas is probably the greatest factor as far as protecting you from the enemy AI. As stated, early war the enemy uses an easier AI for most values, sonar, crew ratings, etc...they both improve. After you play for awhile you may want to tweak the AI a tad harder which is very easy to do.
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You see my dog don't like people laughing. He gets the crazy idea you're laughing at him. Now if you apologize like I know you're going to, I might convince him that you really didn't mean it.
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