She was commissioned into the German Imperial Navy on 22 April 1918 as SM UB-124.

[Note 1] UB-124 was sunk on 20 July 1918 by HMS Marne, Milbrook, Pigeon, and more than 30 patrol craft at 55°43′N 7°51′W / 55.717°N 7.850°W / 55.717; -7.850.

Like all Type UB III submarines, UB-124 carried ten torpedoes and was armed with an 8.8 cm (3.46 in) deck gun.

UB-124 would carry a crew of up to three officers 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 13.9 knots (25.7 km/h; 16.0 mph) when surfaced and 7.6 knots (14.1 km/h; 8.7 mph) when submerged.