SM UB-143

SM UB-143 was a German Type UB III submarine or U-boat in the German Imperial Navy (Kaiserliche Marine) during World War I. She was commissioned into the German Imperial Navy on 3 October 1918 as SM UB-143.

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.

Construction
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 deck gun. UB-143 would carry a crew of up to 3 officer and 31 men and had a cruising range of 7,280 nmi. Displacement was 523 t while surfaced and 653 t when submerged. Her engines enabled her to travel at 13.5 kn when surfaced and 7.5 kn when submerged.