Som-class submarine
The Som class were a series of submarines built for the Imperial Russian Navy in 1904–1907. They were designed by the Electric Boat Company and ordered in the 1904 emergency programme at the time of the Russo-Japanese War. The boats were built in St. Petersburg and were designed to be transportable by train. The first boat,, was originally Fulton, an experimental submarine that was the prototype for and subsequent s. The vessel was sold and delivered to Russia in sections and re-assembled in St. Petersburg.
Ships
| Ship | namesake | Launched | Service / Fate |
| – Сом | Catfish | 1904 | ex Fulton – Delivered to Vladivostok 1904; to Black Sea Fleet then to Baltic Fleet 1915; sunk in collision 10 May 1916. The wreck was found in 2015 in Swedish territorial waters. |
| Beluga – Белуга | Beluga | 1905 | Baltic Fleet – Scuttled 25 February 1918 in Tallinn |
| Losos – Лосось | Salmon | 1905 | Black Sea Fleet – Scuttled 1919 in Sevastopol |
| Peskar – Пескарь | Gudgeon | 1905 | Baltic Fleet – Scuttled 25 February 1918 in Tallinn |
| Schuka – Щука | Pike | April 1905 | Baltic Fleet – Scuttled 25 February 1918 in Tallinn |
| Sterlyad – Стерлядь | Sterlet | 1905 | Baltic Fleet – Scuttled 25 February 1918 in Tallinn |
| Sudak – Судак | Sander | 1907 | Black Sea Fleet – Scuttled 1919 in Sevastopol |