She had a dive time of 15 seconds and was capable of operating at a depth of 75 metres (246 ft).

When submerged, she could operate for 40 nautical miles (74 km; 46 mi) at 4.5 knots (8.3 km/h; 5.2 mph); when surfaced, she could travel 9,850 nautical miles (18,240 km; 11,340 mi) at 7 knots (13 km/h; 8.1 mph).

UC-100 was fitted with six 100 centimetres (39 in) mine tubes, fourteen UC 200 mines, three 50 centimetres (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.

[Note 1] UC-110 was surrendered to the Allies at Harwich in 1919 in accordance with the requirements of the Armistice with Germany.

She was retained by the UK for possible experimental work, but was in the event laid up at Portsmouth until scuttled in the English Channel on 1 July 1920.