SM UB-107

For other ships of the same name, see German submarine U-107.

Career (German Empire)
Name:	UB-107
Ordered:	23 September 1913
Builder:	Blohm & Voss, Hamburg
Yard number:	Werk 313
Launched:	21 July 1917
Commissioned:	16 February 1918
Fate:	Sunk, July 28 – August 3, 1918
General characteristics
Class & type:	German Type UB III submarine
Displacement:	516 long tons (524 t) surfaced 651 long tons (661 t) submerged
Length:	55.3 m (181 ft) o/a
Beam:	5.8 m (19 ft)
Draught:	3.7 m (12 ft)
Propulsion:	2 shafts 6-cylinder diesel engines, 1,100 hp (820 kW) Siemens-Schuckert electric motors, 788 hp (588 kW)
Speed:	13.5 knots (25.0 km/h; 15.5 mph) surfaced 7.5 knots (13.9 km/h; 8.6 mph) submerged
Range:	8,500 mi (13,700 km) at 5 kn (9.3 km/h; 5.8 mph) surfaced 55 mi (89 km) at 4 kn (7.4 km/h; 4.6 mph) submerged
Test depth:	50 m (160 ft)
Complement:	34 men
Armament:	• 5 × torpedo tubes (4 bow, 1 stern) • 10 × torpedoes • 1 × 88 mm (3.5 in) deck gun

SM UB-107 was a German Type UB III submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 23 September 1913 and launched on 21 July 1917. She was commissioned into the German Imperial Navy on 16 February 1918 as SM UB-107. The submarine sank 11 ships in 4 patrols.

The first recorded fate of UB-107 was noted as sunk by depth charge on July 27, 1918 by the Royal Navy trawler Calvis and HMY Vanessa II at position 57°23′N 00°24′W. It has since been argued that the UB-107 was probably not present for the attack by Calvis and Vanessa II as it was the only U-boat that could have been responsible for the sinking of steamers Chloris and John Rettig two and a half hours later at position 53°52′N 00°10′E.

In 1985 divers discovered the wreck of UB-107 one mile north of Flamborough Head at position 54°08′N 00°00′W entangled with another wreck, the SS Malvina, a British steamer torpedoed and sunk on 3 August 1918 by UB-104. UB-107 was identified by the markings on her propellers. It is suggested that either UB-107 suffered an accident of some sort or was lost on a British mine between July 28 and August 3, 1918 leaving all hands lost (38 dead).

Television Documentary

The fate of UB-107 was the subject of an episode of the documentary television series Deep Sea Detectives: "Mystery U-Boat of WWI". The documentary offered various scenarios for the sinking based on historical evidence and exploratory diving at the wreck site.