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.

In July 2015 it was reported that the wreck of Som (Сом) had been located in Swedish waters.