SM UB-46

Wreckage of the UB-46
History
German Empire
Name	UB-46
Ordered	31 July 1915[1]
Builder	AG Weser, Bremen[1]
Yard number	248[1]
Laid down	4 September 1915[1]
Launched	31 May 1916[1]
Commissioned	12 June 1916[1]
Fate	Mined, 7 December 1916
Notes	Torpedo room and battery compartment recovered and preserved
General characteristics [2]
Class and type	Type UB II submarine
Displacement	272 t (268 long tons) surfaced 305 t (300 long tons) submerged
Length	36.90 m (121 ft 1 in) o/a 27.90 m (91 ft 6 in) pressure hull
Beam	4.37 m (14 ft 4 in) o/a 3.85 m (12 ft 8 in) pressure hull
Draught	3.68 m (12 ft 1 in)
Propulsion	1 × propeller shaft 2 × 4-stroke 6-cylinder diesel engine, 284 PS (209 kW; 280 bhp) 2 × electric motor, 280 PS (210 kW; 280 shp)
Speed	8.82 knots (16.33 km/h; 10.15 mph) surfaced 6.22 knots (11.52 km/h; 7.16 mph) submerged
Range	6,940 nmi (12,850 km; 7,990 mi) at 5 knots (9.3 km/h; 5.8 mph) surfaced 45 nmi (83 km; 52 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Complement	22
Armament	2 × 50 cm (19.7 in) bow torpedo tubes 4 torpedoes 1 × 8.8 cm (3.5 in) Uk L/30 deck gun
Service record
Part of:	Pola Flotilla 12 June – 7 October 1916 Constantinople Flotilla 7 October – 7 December 1916
Commanders:	Kptlt. Cäsar Bauer[1] 12 June – 7 December 1916
Operations:	5 patrols
Victories:	4 merchant ships sunk (8,099 GRT)[1]

SM UB-46 was a Type UB II submarine or U-boat for the German Imperial Navy (German: Kaiserliche Marine) during World War I. UB-46 operated in the Mediterranean and the Black Seas, and was sunk by a mine in December 1916.

UB-46 was ordered in July 1915 and was laid down at the AG Weser shipyard in Bremen in September. UB-46 was a little more than 121 feet (37 m) in length and displaced between 270 and 305 tonnes (266 and 300 long tons), depending on whether surfaced or submerged. She was equipped to carry a complement of four torpedoes for her two bow torpedo tubes and had an 5-centimeter (2.0 in) deck gun. As part of a group of six submarines selected for Mediterranean service, UB-46 was broken into railcar sized components and shipped to Pola where she was assembled and launched in May 1916, and commissioned in June.

In early December 1916, during the submarine's fifth patrol, UB-46 struck a mine in the Black Sea a short distance from the north entrance to the Bosphorus and sank with all hands. In her six-month career, UB-46 sank four ships of 8,099 gross register tons (GRT).