Russian submarine Krab (1912)

Krab, c. 1913
History
Russian Empire
Name	Krab
Ordered	1908
Builder	Naval yard in Nikolayev, Black Sea
Launched	September 1912 (some reports say 1913)
Commissioned	1915
In service	1915 - 1917
Fate	Scuttled April 1919, raised 1935 and scrapped
General characteristics
Displacement	512 tons surface 740 tons submerged
Length	52.8 m (173 ft)
Beam	4.3 m (14 ft)
Draft	3.9 m (13 ft)
Propulsion	2 shaft gasoline electric 4 petrol engines 1,200 hp 2 electric motors 400 hp
Speed	11.8 knots (21.9 km/h; 13.6 mph) surfaced 7 knots (13 km/h; 8.1 mph) submerged
Range	1,700 nmi (3,100 km; 2,000 mi)
Complement	50
Armament	2 × 18-inch (457 mm) torpedo tubes (bow) and two torpedo drop collars 1 × 75 mm gun 2 × machine guns 60 mines

Krab (Russian: Краб, lit. 'Crab') was a submarine minelayer built for the Imperial Russian Navy. She was designed by Mikhail Petrovich Nalyotov as the world's first submarine minelayer, although due to construction delays the German UC submarines entered service earlier. The mines were stowed in two horizontal galleries exiting through the stern. Diving depth was 45 metres. This ship was built by the Naval yard in Nikolayev by the Black Sea (now Mykolaiv, Ukraine). She was ordered in 1908, launched in September 1912 (or early 1913, sources differ) and entered service in 1915.