SM UB-115

	UB-148 at sea, a U-boat similar to UB-115.
History
German Empire
Name	UB-115
Ordered	6 / 8 February 1917
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	321
Launched	4 November 1917
Commissioned	28 May 1918
Fate	Sunk 29 September 1918 by British warships and aircraft at 55°13′N 1°22′W / 55.217°N 1.367°W
General characteristics
Class and type	German Type UB III submarine
Displacement	519 t (511 long tons) surfaced; 649 t (639 long tons) submerged;
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.70 m (12 ft 2 in)
Propulsion	2 × propeller shaft; 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW); 2 × AEG electric motors, 780 shp (580 kW);
Speed	13.3 knots (24.6 km/h; 15.3 mph) surfaced; 7.5 knots (13.9 km/h; 8.6 mph) submerged;
Range	7,420 nmi (13,740 km; 8,540 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 × 10.5 cm (4.13 in) deck gun;
Service record
Part of:	Flandern I Flotilla; 3 – 29 September 1918;
Commanders:	Oblt.z.S. Reinhold Thomsen; 28 May – 29 September 1918;
Operations:	2 patrols
Victories:	1 merchant ship sunk ; (336 GRT)

SM UB-115 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 28 May 1918 as SM UB-115.^{[Note 1]} She was the only German submarine commissioned with the number 115.

UB-115 was sunk by British warships, including HMS Ouse and HMS Star, and the rigid airship R29 at 55°13′N 1°22′W / 55.217°N 1.367°W / 55.217; -1.367 using depth charges and aerial bombs.^[1]

Construction

She was built by Blohm & Voss of Hamburg and following just under a year of construction, launched at Hamburg on 4 November 1917. UB-115 was commissioned in the spring the next year under the command of Oblt.z.S. Reinhold Thomsen. Like all Type UB III submarines, UB-115 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun. UB-115 would carry a crew of up to 3 officers and 31 men and had a cruising range of 7,420 nautical miles (13,740 km; 8,540 mi). UB-115 had a displacement of 519 t (511 long tons) while surfaced and 649 t (639 long tons) when submerged. Her engines enabled her to travel at 13.3 knots (24.6 km/h; 15.3 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.

Fate

On 29 September 1918 while under the command of Reinhold Thomsen, UB-115 was engaged by armed trawlers (amongst others Viola), the airship R29, HMS Ouse and HMS Star. UB-115 was depth charged until destroyed and went down at position 55°14′46″N 1°22′45″W / 55.24611°N 1.37917°W / 55.24611; -1.37917 (WGS84), about 4.5 nautical miles (8.3 km; 5.2 mi) northeast of Beacon Point, Newton-by-the-Sea, off Northumberland. All 39 men aboard the submarine died in the attack and sinking.^[4] ^[5]

UB-115's wreck lies in two pieces and is covered in soft corals and an accretion formed from fly ash from a local power plant.^[4]

Summary of raiding history

Date	Name	Nationality	Tonnage^{[Note 2]}	Fate^[6]
21 September 1918	Staithes	United Kingdom	336	Sunk

References

Notes

^ "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.
^ Tonnages are in gross register tons

Citations

^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.
^ Rössler 1979, p. 66.
^ Helgason, Guðmundur. "WWI U-boat commanders: Reinhold Thomsen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.
^ ^a ^b Helgason, Guðmundur. "WWI U-boat commanders: UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 September 2010.
^ MHSC. "Viola-Dias, War, Distant Waters and the Hull Fishing Industry in Both World Wars" (PDF). MHSC Maritime Historical Studies Centre. University of Hull. Archived from the original (PDF) on 18 March 2009. Retrieved 3 March 2009.
^ Helgason, Guðmundur. "Ships hit by UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.

Bibliography

Bendert, Harald (2000). Die UB-Boote der Kaiserlichen Marine, 1914–1918. Einsätze, Erfolge, Schicksal (in German). Hamburg: Verlag E.S. Mittler & Sohn GmbH. ISBN 3-8132-0713-7.
Gröner, Erich; Jung, Dieter; Maass, Martin (1991). German Warships 1815–1945, U-boats and Mine Warfare Vessels. Vol. 2. Translated by Thomas, Keith; Magowan, Rachel. London: Conway Maritime Press. ISBN 0-85177-593-4.
Rössler, Eberhard (1979). Die deutschen U-Boote und ihre Werften: eine Bilddokumentation über den deutschen U-Bootbau; in zwei Bänden (in German). Vol. I. Munich: Bernard & Graefe. ISBN 3-7637-5213-7.

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[4] "SM" stands for "Seiner Majestät" (English: His Majesty's) and combined with the U for Unterseeboot would be translated as His Majesty's Submarine.

[tonnage-7] Tonnages are in gross register tons

[FOOTNOTEGröner199125–30-1] ^ ^a ^b ^c ^d ^e ^f Gröner 1991, pp. 25–30.

[FOOTNOTERössler197966-2] Rössler 1979, p. 66.

[3] Helgason, Guðmundur. "WWI U-boat commanders: Reinhold Thomsen". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.

[uboat.net-5] Helgason, Guðmundur. "WWI U-boat commanders: UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 29 September 2010.

[violahull-6] MHSC. "Viola-Dias, War, Distant Waters and the Hull Fishing Industry in Both World Wars" (PDF). MHSC Maritime Historical Studies Centre. University of Hull. Archived from the original (PDF) on 18 March 2009. Retrieved 3 March 2009.

[8] Helgason, Guðmundur. "Ships hit by UB 115". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 10 March 2015.

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[Note 2]

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v t e German Type UB III submarines
SM UB-48 SM UB-49 SM UB-50 SM UB-51 SM UB-52 SM UB-53 SM UB-54 SM UB-55 SM UB-56 SM UB-57 SM UB-58 SM UB-59 SM UB-60 SM UB-61 SM UB-62 SM UB-63 SM UB-64 SM UB-65 SM UB-66 SM UB-67 SM UB-68 SM UB-69 SM UB-70 SM UB-71 SM UB-72 SM UB-73 SM UB-74 SM UB-75 SM UB-76 SM UB-77 SM UB-78 SM UB-79 SM UB-80 SM UB-81 SM UB-82 SM UB-83 SM UB-84 SM UB-85 SM UB-86 SM UB-87 SM UB-88 SM UB-89 SM UB-90 SM UB-91 SM UB-92 SM UB-93 SM UB-94 SM UB-95 SM UB-96 SM UB-97 SM UB-98 SM UB-99 SM UB-100 SM UB-101 SM UB-102 SM UB-103 SM UB-104 SM UB-105 SM UB-106 SM UB-107 SM UB-108 SM UB-109 SM UB-110 SM UB-111 SM UB-112 SM UB-113 SM UB-114 SM UB-115 SM UB-116 SM UB-117 SM UB-118 SM UB-119 SM UB-120 SM UB-121 SM UB-122 SM UB-123 SM UB-124 SM UB-125 SM UB-126 SM UB-127 SM UB-128 SM UB-129 SM UB-130 SM UB-131 SM UB-132 SM UB-133 SM UB-136 SM UB-142 SM UB-143 SM UB-144 SM UB-145 SM UB-148 SM UB-149 SM UB-150 SM UB-154 SM UB-155
Preceded by: Type UB II Followed by: Type VII (World War II)
List of U-boats of Germany

v t e Shipwrecks and maritime incidents in September 1918
Shipwrecks	1 Sep: Mesaba 5 Sep: SM UC-91 9 Sep: SM U-92 10 Sep: SM UB-83 15 Sep: HMS Sarnia 16 Sep: USS Buena Ventura, HMS Glatton 20 Sep: Circé 25 Sep: SM U-156 27 Sep: USCGC Tampa 29 Sep: SM UB-115 30 Sep: USS Ticonderoga, SM U-102, SM UB-127 Unknown date: SM UB-104, SM UB-113
Other incidents	5 Sep: USS Mount Vernon 6 Sep: D.R. Hanna, USS Hisko 8 Sep: HMS Amphitrite 12 Sep: USFS Auklet, SS Princess Sophia 27 Sep: USS Relief, USS Williams 29 Sep: USS Minnesota
1917 1918 1919 August 1918 October 1918

History
UB-148 at sea, a U-boat similar to UB-115.
German Empire
Name	UB-115
Ordered	6 / 8 February 1917^[2]
Builder	Blohm & Voss, Hamburg
Cost	3,714,000 German Papiermark
Yard number	321
Launched	4 November 1917^[1]
Commissioned	28 May 1918^[1]
Fate	Sunk 29 September 1918 by British warships and aircraft at 55°13′N 1°22′W / 55.217°N 1.367°W / 55.217; -1.367^[1]
General characteristics ^[1]
Class and type	German Type UB III submarine
Displacement	519 t (511 long tons) surfaced 649 t (639 long tons) submerged
Length	55.30 m (181 ft 5 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.70 m (12 ft 2 in)
Propulsion	2 × propeller shaft 2 × MAN-Vulcan four-stroke 6-cylinder diesel engines, 1,085 bhp (809 kW) 2 × AEG electric motors, 780 shp (580 kW)
Speed	13.3 knots (24.6 km/h; 15.3 mph) surfaced 7.5 knots (13.9 km/h; 8.6 mph) submerged
Range	7,420 nmi (13,740 km; 8,540 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^[1]
Armament	5 × 50 cm (19.7 in) torpedo tubes (4 bow, 1 stern) 10 torpedoes 1 × 10.5 cm (4.13 in) deck gun
Service record
Part of:	Flandern I Flotilla 3 – 29 September 1918
Commanders:	Oblt.z.S. Reinhold Thomsen^[3] 28 May – 29 September 1918
Operations:	2 patrols
Victories:	1 merchant ship sunk (336 GRT)