I think I may have figured this out. I'm not sure what it's called but it's the little solution button (red S) that when you mouse over gives you a rating. ie poor, good, very good. When it gets to very good hit the button and it'll say 'very good locked', it unlocks your periscope but the torpedoes hit. It was late last night so I could be way off. I'm at work at the moment so if someone wants to give it a go let me know if it works.
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