SM UB-125

	UB-148 at sea, a U-boat similar to UB-125.
History
German Empire
Name	UB-125
Ordered	6 / 8 February 1917
Builder	AG Weser, Bremen
Cost	3,654,000 German Papiermark
Yard number	298
Laid down	19 July 1917
Launched	16 April 1918
Commissioned	18 May 1918
Fate	Surrendered 20 November 1918
Japan
Name	O-6
Commissioned	1920
Decommissioned	1921
Fate	Broken up in Kure
General characteristics
Class and type	German Type UB III submarine
Displacement	512 t (504 long tons) surfaced; 643 t (633 long tons) submerged;
Length	55.85 m (183 ft 3 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.72 m (12 ft 2 in)
Propulsion	2 × propeller shaft ; 2 × Körting four-stroke 6-cylinder diesel engines, 1,050 bhp (780 kW); 2 × Siemens-Schuckert electric motors, 780 shp (580 kW);
Speed	13.9 knots (25.7 km/h; 16.0 mph) surfaced; 7.6 knots (14.1 km/h; 8.7 mph) submerged;
Range	7,280 nmi (13,480 km; 8,380 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:	III Flotilla; 21 July – 11 November 1918;
Commanders:	Kptlt. Fritz Schubert; 18 May – 20 July 1918; Oblt.z.S. Werner Vater; 21 July – 11 November 1918;
Operations:	2 patrols
Victories:	6 merchant ships sunk ; (13,307 GRT); 1 merchant ship damaged ; (6,082 GRT);

Last updated January 24, 2024

SM UB-125 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 18 May 1918 as SM UB-125.^{[Note 1]}

Construction

She was built by AG Weser of Bremen and following just under a year of construction, launched at Bremen on 16 April 1918. UB-125 was commissioned later the same year under the command of Kptlt. Fritz Schubert. Like all Type UB III submarines, UB-125 carried 10 torpedoes and was armed with a 10.5 cm (4.13 in) deck gun. UB-125 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,280 nautical miles (13,480 km; 8,380 mi). UB-125 had a displacement of 512 t (504 long tons) while surfaced and 643 t (633 long tons) when submerged. Her engines enabled her to travel at 13.9 knots (25.7 km/h; 16.0 mph) when surfaced and 7.6 knots (14.1 km/h; 8.7 mph) when submerged.

Summary of raiding history

Date	Name	Nationality	Tonnage^{[Note 2]}	Fate^[6]
29 August 1918	Atxeri Mendi	Spain	2,424	Sunk
30 August 1918	Onega	United States	3,636	Sunk
1 September 1918	Actor	United Kingdom	6,082	Damaged
3 September 1918	Brava	Portugal	3,184	Sunk
3 September 1918	Lake Owens	United States	2,308	Sunk
4 September 1918	Bogstad	Norway	1,589	Sunk
12 September 1918	Skjold	Denmark	166	Sunk

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SM UB-142 was a German Type UB III submarine or U-boat in the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 31 August 1918 as SM UB-142.

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SM UB-148 was a German Type UB III submarine or U-boat built for the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 19 September 1918 as UB-148. UB-148 was surrendered to the United States in accordance with the requirements of the Armistice with Germany on 1 December 1918 and later sunk as target by USS Sicard.

SM UB-149 was a German Type UB III submarine or U-boat built for the German Imperial Navy during World War I. She was commissioned into the German Imperial Navy on 22 October 1918 as UB-149. UB-149 was surrendered to Britain in accordance with the requirements of the Armistice with Germany on 22 November 1918 and broken up at Swansea in 1922.

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

↑ Rössler 1979, p. 55.
↑ Helgason, Guðmundur. "WWI U-boats: UB 125". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 13 February 2009.
1 2 3 4 5 6 7 8 9 Gröner 1991, pp. 25–30.
↑ Helgason, Guðmundur. "WWI U-boat commanders: Fritz Schubert". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 March 2015.
↑ Helgason, Guðmundur. "WWI U-boat commanders: Werner Vater". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 March 2015.
↑ Helgason, Guðmundur. "Ships hit by UB 125". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 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). U-boats and Mine Warfare Vessels. German Warships 1815–1945. 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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[6] "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

[FOOTNOTERössler197955-1] Rössler 1979, p. 55.

[UB-125-2] Helgason, Guðmundur. "WWI U-boats: UB 125". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 13 February 2009.

[FOOTNOTEGröner199125–30-3] 1 2 3 4 5 6 7 8 9 Gröner 1991, pp. 25–30.

[4] Helgason, Guðmundur. "WWI U-boat commanders: Fritz Schubert". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 March 2015.

[5] Helgason, Guðmundur. "WWI U-boat commanders: Werner Vater". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 March 2015.

[8] Helgason, Guðmundur. "Ships hit by UB 125". German and Austrian U-boats of World War I - Kaiserliche Marine - Uboat.net. Retrieved 11 March 2015.

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[Note 1]

[Note 2]

[6]

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

History
UB-148 at sea, a U-boat similar to UB-125.
German Empire
Name	UB-125
Ordered	6 / 8 February 1917^[1]
Builder	AG Weser, Bremen
Cost	3,654,000 German Papiermark
Yard number	298
Laid down	19 July 1917^[2]
Launched	16 April 1918^[3]
Commissioned	18 May 1918^[3]
Fate	Surrendered 20 November 1918^[3]
Japan
Name	O-6
Commissioned	1920^[3]
Decommissioned	1921^[3]
Fate	Broken up in Kure ^[3]
General characteristics ^[3]
Class and type	German Type UB III submarine
Displacement	512 t (504 long tons) surfaced 643 t (633 long tons) submerged
Length	55.85 m (183 ft 3 in) (o/a)
Beam	5.80 m (19 ft)
Draught	3.72 m (12 ft 2 in)
Propulsion	2 × propeller shaft 2 × Körting four-stroke 6-cylinder diesel engines, 1,050 bhp (780 kW) 2 × Siemens-Schuckert electric motors, 780 shp (580 kW)
Speed	13.9 knots (25.7 km/h; 16.0 mph) surfaced 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range	7,280 nmi (13,480 km; 8,380 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^[3]
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:	III Flotilla 21 July – 11 November 1918
Commanders:	Kptlt. Fritz Schubert^[4] 18 May – 20 July 1918 Oblt.z.S. Werner Vater^[5] 21 July – 11 November 1918
Operations:	2 patrols
Victories:	6 merchant ships sunk (13,307 GRT) 1 merchant ship damaged (6,082 GRT)