Russian Narval-class submarine

	Russian submarine Narval under construction
Class overview
Name	Narval class
Builders	Nikolayev Dockyard
Operators	Imperial Russian Navy
In commission	1914–1919
Completed	3
Lost	3
General characteristics
Type	Submarine
Displacement	621 tons surfaced; 994 tons submerged;
Length	70.1 m (230.0 ft)
Beam	6.5 m (21.3 ft)
Draught	3.5 m (11.5 ft)
Installed power	640 hp (480 kW) (diesel); 900 hp (670 kW) (electric);
Propulsion	2 shafts; Diesel-electric propulsion; 4 diesel engines (2 per shaft);
Speed	9.5 kn (17.6 km/h) (surfaced); 11.5 kn (21.3 km/h) (submerged);
Range	12 days, 3500 miles at 6.5 knots; 103 miles under water at 4 knots;
Complement	47
Armament	2 × bow 450 mm (18-inch) torpedo tubes; 2 × stern 450 mm (18-inch) torpedo tubes; 8 × external torpedo drop collars; 1 × 75 mm gun; 1 × 57 mm gun; 2 × 7.62 mm machine guns; since 1917; 2 × bow 450 mm (18-inch) torpedo tubes; 2 × stern 450 mm (18-inch) torpedo tubes; 4 × external torpedo drop collars; 2 × 75 mm gun; 1 × 37 mm gun; 2 × 7.62 mm machine guns;

The Narval class were a group of submarines built for the Imperial Russian Navy. They were designed by the Electric Boat Company and ordered in the 1911 programme as the "Holland 31A" design. The Narval class had advanced features including watertight bulkheads, a crash diving tank and gravitationally filled ballast tanks which did not feature in contemporary Russian-designed boats. The boats were well regarded by the Russian Navy and served in the Black Sea Fleet during World War I, during which they sank 8 merchant ships and 74 coastal vessels.

At the end of 1917, the submarines were transferred to the reserve. The submarines were scuttled by British forces in April 1919 near Sevastopol.

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