SM UB-53

For other ships with the same name, see German submarine U-53.

UB-148 at sea, a U-boat similar to UB-53.
History
German Empire
Name:	UB-53
Ordered:	20 May 1916
Builder:	Blohm & Voss, Hamburg
Cost:	3,276,000 German Papiermark
Yard number:	298
Launched:	9 March 1917
Commissioned:	21 August 1917
Fate:	sunk 3 August 1918 at by mines, 10 dead
General characteristics
Class & type:	German Type UB III submarine
Displacement:	516 t (508 long tons) surfaced 651 t (641 long tons) submerged
Length:	55.30 m (181 ft 5 in) (o/a)
Beam:	5.80 m (19.0 ft)
Draught:	3.68 m (12 ft 1 in)
Propulsion:	2 × propeller shaft 2 × MAN four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW) 2 × Siemens-Schuckert electric motors, 780 shp (580 kW)
Speed:	13.6 knots (25.2 km/h; 15.7 mph) surfaced 8 knots (15 km/h; 9.2 mph) submerged
Range:	9,040 nmi (16,740 km; 10,400 mi) at 6 knots (11 km/h; 6.9 mph) surfaced 55 nmi (102 km; 63 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth:	50 m (160 ft)
Complement:	3 officers, 31 men
Armament:	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern) 10 torpedoes 1 × 8.8 cm (3.46 in) deck gun
Service record
Part of:	Pola/Mittelmeer I Flotilla 1 November 1917 – 3 August 1918
Commanders:	Kptlt. Robert Sprenger 21 August 1917 – 3 August 1918
Operations:	5 patrols
Victories:	14 merchant ships sunk (16,586 GRT)

SM UB-53 was a German Type UB III submarine or U-boat in the Imperial German Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the Pola Flotilla of the German Imperial Navy on 21 August 1917 as SM UB-53.

She operated as part of the Pola Flotilla based in Cattaro. UB-53 was sunk by mines of the Otranto Barrage on 3 August 1918 at in the Otranto Strait, 10 crew members died.

Construction

Main article: German Type UB III submarine

UB-53 was ordered by the GIN on 20 May 1916. She was built by Blohm & Voss, Hamburg and following just under a year of construction, launched at Hamburg on 9 March 1917. UB-53 was commissioned later that same year under the command of Kptlt. Robert Sprenger. Like all Type UB III submarines, UB-53 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-53 would carry a crew of up to 3 officer and 31 men and had a cruising range of 9,040 nautical miles (16,740 km; 10,400 mi). UB-53 had a displacement of 516 t (508 long tons) while surfaced and 651 t (641 long tons) when submerged. Her engines enabled her to travel at 13.6 knots (25.2 km/h; 15.7 mph) when surfaced and 8 knots (15 km/h; 9.2 mph) when submerged.

Summary of raiding history

Date	Name	Nationality	Tonnage	Fate
17 December 1917	Nina	Greece	126	Sunk
31 December 1917	Lily	Greece	2,993	Sunk
20 February 1918	Taxiarchis	Greece	292	Sunk
26 February 1918	Saida	France	82	Sunk
2 March 1918	Euxeinos	Greece	2,891	Sunk
6 March 1918	Kalgan	United Kingdom	1,862	Sunk
9 April 1918	Aveiro	Portugal	2,209	Sunk
22 April 1918	Kheda Moulekar	France	40	Sunk
22 April 1918	Marshalla	United Kingdom	77	Sunk
22 April 1918	Sadika	France	45	Sunk
22 April 1918	Welbeck Hall	United Kingdom	5,643	Sunk
24 April 1918	Mabrouska	France	256	Sunk
27 April 1918	Azizeh	France	30	Sunk
27 April 1918	Nemaat Kheda	France	40	Sunk