UC-II type submarine
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UC-II type minelaying submarines were used by the Kaiserliche Marine during the World War I. They displaced 417 tons, carried 7 torpedoes and up to 18 mines.
If judged only by the numbers of enemy vessels destroyed, the UC-II is the most successful submarine design in the history: According to modern estimates, they sank more than 1800 enemy vessels. [1]