History
German Empire
Name	U-116
Builder	Schichau-Werke, Elbing
Cost	4,100,000 Goldmark
Yard number	987
Laid down	September 1916
Launched	1918
Fate	never completed, broken up at Danzig
General characteristics
Class and type	German Type U 115 submarine
Displacement	882 t (868 long tons) surfaced 1,233 t (1,214 long tons) submerged
Length	72.30 m (237 ft 2 in)
Beam	6.50 m (21 ft 4 in)
Draught	4 m (13 ft 1 in)
Propulsion	2 shafts 2 × MAN four-stroke diesel motors with 2,400 PS (1,770 kW; 2,370 shp) 2 × SSW double dynamos with 1,200 PS (880 kW; 1,180 shp) 450 rpm surfaced 330 rpm submerged
Speed	16 knots (30 km/h; 18 mph) surfaced 9 knots (17 km/h; 10 mph) submerged
Range	11,470 nautical miles (21,240 km; 13,200 mi) at 8 kn surfaced 60 nautical miles (110 km; 69 mi) at 4.5 kn submerged
Test depth	50 m (160 ft)
Complement	4 officers, 32 men
Armament	6 × 45 cm (18 in) torpedo tubes (4 bow, 2 stern) 1 × 10.5 cm (4.1 in) L/45 and 1 × 8.8 cm (3.5 in) L/30 deck gun

SM U-116^{[Note 1]} was a German Type 115 U-boat of the Imperial German Navy built at Schichau-Werke, Danzig. As her sister ship SM U-115, she was never completed and ultimately broken up in Danzig after the Armistice with Germany. Her main engines were used in M/S Adolf Sommerfeld ex SMS Gefion. Both boats had been offered to the IGN free of charge by Schichau in an attempt to gain experience in building submarines (Williamson, 15).

• 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. p. 40. ISBN 0-85177-593-4.
• Gordon Williamson, U-boats of the Kaiser's Navy. Osprey, 2002, ISBN 1-84176-362-4
• R.H. Gibson, Maurice Prendergast, The German Submarine War 1914–1918, Periscope Publishing Ltd., 2002, ISBN 1-904381-08-1, p. 114
• Eberhard Rössler, The U-boat: the evolution and technical history of German submarines, Naval Institute Press, 1981, ISBN 0-87021-966-9, p. 56
• Stefan Lipsky, Florian Lipsky, Deutsche U-Boote: hundert Jahre Technik und Entwicklung, Mittler, 2006, ISBN 3-8132-0868-0, p. 85