History
The Plunger-class submarines were built at the beginning of the twentieth century largely as experimental vessels. This class of submarines was built at two different locations on both coasts of the United States. All seven boats were renamed to A-type designations (A-1 through A-7) on 17 November 1911. They were given corresponding alphanumeric hull numbers on 17 July 1920, after all but Grampus (SS-4) and Pike (SS-6) had been decommissioned. All of the Plunger-class ships were decommissioned by 1921 and used as targets.
Read more about this topic: Plunger Class Submarine
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