How about "One of our Submarines"? - http://www.amazon.co.uk/One-Submarin.../dp/1844151069
Has a nice ring to it, and still applies if the campaign expands to other theatres.
Mike. 
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"I am the battleship Jean Bart. This name originates from a certain 'respected' privateer... Yes? You want to know what privateers are? Hmph, they are pirates that rob openly under the banner of their country."
Jean Bart from the mobile game Azur Lane.
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