[Note 1] UB-103 was sunk in the English Channel by British warships and SSZ 1, a SSZ class blimp.

UB-103 was commissioned later the same year, under the command of KptLt Paul Hundius.

Like all Type UB III submarines, UB-103 carried 10 torpedoes and was armed with a 8.8 cm (3.46 in) deck gun.

UB-103 had a crew of up to three officers and 31 men, and its cruising range was 7,420 nautical miles (13,740 km; 8,540 mi).

Her engines enabled her to travel at 13.3 knots (24.6 km/h; 15.3 mph) when surfaced and 7.4 knots (13.7 km/h; 8.5 mph) when submerged.