That is a net cutter. Early war boats were equipped with them to (in theory) be able to cut anti-submarine nets. They were of limited use so they were removed later on in order to streamline the boat.
Ramming in a submarine is a suicidal tactic. You risk damage to your pressure hull and a submarine that can't dive is a dead duck.
Not sure how it applies in game as I've never tried it.
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They don’t think it be like it is, but it do.
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