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| Name: | SM U-16 |
| Ordered: | 1 April 1915 |
| Builder: | AG Weser, Bremen |
| Yard number: | 233 |
| Laid down: | April 1915 |
| Launched: | 31 August 1915 |
| Completed: | 30 September 1915 |
| Commissioned: | 6 October 1915 |
| Fate: | sunk, 17 October 1916 |
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| General characteristics | |
| Type: | U-10-class submarine |
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| Beam: | 3.15 m (10 ft 4 in) |
| Draught: | 3.03 m (9 ft 11 in) |
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| Test depth: | 50 m (160 ft) |
| Complement: | 17 |
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SM U-16 or U-XVI was a U-10-class submarine or U-boat of the Austro-Hungarian Navy (German: Kaiserliche und Königliche Kriegsmarine or K.u. K. Kriegsmarine) during World War I. U-16 was constructed in Germany and shipped by rail to Pula where she was assembled and completed in September 1915. She was commissioned in October 1915.
For most of her career, U-16 operated in the Adriatic out of Kotor patrolling off the Albanian coast. The U-boat sank one small sailing ship in November and seized another in December. U-16 carried Field Marshal Svetozar Borojević of the Austro-Hungarian Army as an observer while performing diving tests after engine repairs in January 1916. A water leak in March flooded U-16's batteries and put the U-boat out of action for about six weeks of repairs. While operating off Vlorë in mid-October 1916, U-16 sank an Italian destroyer acting as a convoy escort. U-16 was sunk in the ensuing action, but sources are not clear on the exact cause of her sinking. In all U-16 sank three ships with a combined tonnage of 711. She was the only U-10-class submarine sunk during the war.
U-16 was a small, coastal submarine that displaced 125.5 long tons (127.5 t) surfaced and 140.25 long tons (142.50 t) submerged. She featured a single shaft, a single 60 bhp (45 kW) Daimler diesel engine for surface running, and a single 120 shp (89 kW) electric motor for submerged travel.U-16 was capable of up to 6.5 knots (12.0 km/h; 7.5 mph) while surfaced and 5.5 knots (10.2 km/h; 6.3 mph) while submerged at a diving depth of up to 50 metres (160 ft). She was designed for a crew of 17 officers and men.