Because I love trivia it has to be the British subs H-28 and X-1.
H-28 is the only submarine to have made war patrols in both World Wars.
X-1 (A U-Cruiser) is the only RN vessel to have been designed, built, commissioned, payed off and scraped entirely between the two World Wars.
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"Pitt was the greatest fool who ever lived to encourage a mode of war which they who commanded the seas did not want, and which, if successful, would deprive them of it." Earl St.Vincent (allegedly)
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