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Delfin was the first combat-capable Russian submarine. It was laid down in July 1901 by the Baltic Works in Saint Petersburg, added to the Imperial Russian Navy list in September 1902, and launched in May 1903 before beginning sea trials in the Gulf of Finland in June 1903. The trials were finished in October of that year and the submarine entered service, initially designated as a torpedo boat. During its construction it was initially named No. 113, which was later changed to No. 150, before finally receiving the name Delfin on 13 June 1904. The submarine's armament included two Drzewiecki drop collars on the outside of the submarine, each holding one torpedo, and a single machine gun.
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