Som-class submarine

	Russian submarine Beluga.
Class overview
Name	Som class
Builders	Nevski Yard, St. Petersburg
Operators	Imperial Russian Navy
In commission	1905–1913
Completed	7
Lost	7
General characteristics
Type	Submarine
Displacement	105 tons surfaced; 122 tons submerged;
Length	20 m (66 ft)
Beam	3.5 m (11 ft)
Draught	2.9 m (9 ft 6 in)
Propulsion	1 shaft: petrol engine/electric motor; 160 hp (120 kW)/70 hp (52 kW);
Speed	8.5 knots (15.7 km/h; 9.8 mph) surfaced; 6 knots (11 km/h; 6.9 mph) submerged;
Complement	24
Armament	1× 15-inch (381 mm) torpedo tube (bow); 1× machine gun;

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, Som, was originally Fulton, an experimental submarine that was the prototype for USS Plunger and subsequent Plunger-class submarines. The vessel was sold and delivered to Russia in sections and re-assembled in St. Petersburg.

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