She was commissioned into the German Imperial Navy on 3 October 1918 as SM UB-143.

[Note 1] She was surrendered to Japan on 1 December 1918 and served in the Imperial Japanese Navy as O-7 until 1921, when she was broken up in Yokohama.

[3] Built by AG Weser of Bremen in one year of construction, UB-143 was launched at Bremen on 21 August 1918, carried 10 torpedoes and was armed with a 10.5 cm (4.13 in) deck gun.

UB-143 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,280 nautical miles (13,480 km; 8,380 mi).

Her engines enabled her to travel at 13.5 knots (25.0 km/h; 15.5 mph) when surfaced and 7.5 knots (13.9 km/h; 8.6 mph) when submerged.