Type UC III minelaying submarines were used by the Imperial German Navy (Kaiserliche Marine) during World War I. They displaced 474 tonnes (467 long tons) at the surface and 571 t (562 long tons) submerged, carried guns, 7 torpedoes and up to 14 mines. The ships were double-hulled with improved range and sea-keeping compared to the UC II type. The type had better seagoing, maneuvering and turning capabilities than its predecessor, while underwater stability was reduced. A total of 113 Type UC III submarines were ordered by the Imperial German Navy, but only 25 U-boats were completed before the Armistice with Germany in 1918. Of those, 16 U-boats actually served in the war. 54 building orders were cancelled in 1918, while 34 U-boats were never completed and broken up in the ship yards.
== Design == German Type UC III submarines had a displacement of 491 tonnes (483 long tons) when at the surface and 571 tonnes (562 long tons) while submerged. They had a length overall of 56.51 m (185 ft 5 in), a beam of 5.54 m (18 ft 2 in), and a draught of 3.77 m (12 ft 4 in). The submarines were powered by two six-cylinder four-stroke diesel engines each producing 300 metric horsepower (220 kW; 300 shp) (a total of 600 metric horsepower [440 kW; 590 shp]), two electric motors producing 770 metric horsepower (570 kW; 760 shp), and two propeller shafts. They had a dive time of 15 seconds and were capable of operating at a depth of 75 metres (246 ft). The submarines were designed for a maximum surface speed of 11.5 knots (21.3 km/h; 13.2 mph) and a submerged speed of 6.6 knots (12.2 km/h; 7.6 mph). When submerged, they could operate for 40 nautical miles (74 km; 46 mi) at 4.5 knots (8.3 km/h; 5.2 mph); when surfaced, they could travel 9,850 nautical miles (18,240 km; 11,340 mi) at 7 knots (13 km/h; 8.1 mph). UC III-class boats were fitted with six 100-centimetre (39 in) mine tubes, fourteen UC 200 mines, three 50-centimetre (20 in) torpedo tubes (one on the stern and two on the bow), seven torpedoes, and one 10.5 cm (4.1 in) SK L/45 or 8.8 cm (3.5 in) Uk L/30 deck gun. Their complement was twenty-six crew members.
List of Type UC III submarines
=== Serving in World War I === There were 16 Type UC III submarines serving with the Imperial German Navy during World War I.
SM UC-90 SM UC-91 SM UC-92 SM UC-93 SM UC-94 SM UC-95 SM UC-96 SM UC-97 SM UC-98 SM UC-99 SM UC-100 SM UC-101 SM UC-102 SM UC-103 SM UC-104 SM UC-105
=== Completed after Armistice and surrendered to the Allies === SM UC-106 SM UC-107 SM UC-108 SM UC-109 SM UC-110 SM UC-111 SM UC-112 SM UC-113 SM UC-114
=== Broken up at yard === SM UC-80 SM UC-81 SM UC-82 SM UC-83 SM UC-84 SM UC-85 SM UC-86 SM UC-87 SM UC-88 SM UC-89 SM UC-115 SM UC-116 SM UC-117 SM UC-118 SM UC-119 SM UC-120 SM UC-121 SM UC-122 SM UC-123 SM UC-124 SM UC-125 SM UC-126 SM UC-127 SM UC-128