SM U-99[Note 1] was one of the 329 submarines serving in the Imperial German Navy in World War I.
U-99 was engaged in the naval warfare and took part in the First Battle of the Atlantic.[3]
U-99 had a displacement of 750 tonnes (740 long tons) when at the surface and 952 tonnes (937 long tons) while submerged.[1] She had a total length of 67.60 m (221 ft 9 in), a pressure hull length of 54.02 m (177 ft 3 in), a beam of 6.32 m (20 ft 9 in), a height of 8.25 m (27 ft 1 in), and a draught of 3.65 m (12 ft 0 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,200 metric horsepower (880 kW; 1,200 shp) engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 metres (160 ft).[1]
The submarine had a maximum surface speed of 16.5 knots (30.6 km/h; 19.0 mph) and a maximum submerged speed of 8.8 knots (16.3 km/h; 10.1 mph).[1] When submerged, she could operate for 45 nautical miles (83 km; 52 mi) at 5 knots (9.3 km/h; 5.8 mph); when surfaced, she could travel 10,100 nautical miles (18,700 km; 11,600 mi) at 8 knots (15 km/h; 9.2 mph). U-99 was fitted with six 50 centimetres (20 in) torpedo tubes (four at the bow and two at the stern), twelve to sixteen torpedoes, and one 10.5 cm (4.1 in) SK L/45 deck gun. She had a complement of thirty-six (thirty-two crew members and four officers).[1]
The Royal Navy submarine HMS J2 is credited with sinking U-99 in the Northern North Sea on 7 July 1917, although the attribution is uncertain.
58°0′N 30°5′E / 58.000°N 30.083°E / 58.000; 30.083