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HMS S1 was originally an experimental submarine, HMS Swordfish, the only member of her class and launched in 1916. The submarine was converted to a surface patrol boat in 1917 and renamed HMS S1.
List of ships with the same or similar names
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.
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