She was commissioned into the German Imperial Navy on 5 August 1917 as SM UB-64.

[Note 1] UB-64 was surrendered to the British on 21 November 1918 in accordance with the requirements of the Armistice with Germany and broken up in Fareham in 1921.

UB-64 was commissioned later that same year under the command of Kptlt.

Like all Type UB III submarines, UB-64 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun.

UB-64 would carry a crew of up to 3 officer and 31 men and had a cruising range of 8,420 nautical miles (15,590 km; 9,690 mi).