German submarine U-339

German submarine U-339 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on 7 July 1941 at the Nordseewerke yard at Emden as yard number 211, launched on 30 June 1942 and commissioned on 25 August under the command of Kapitänleutnant Georg-Wilhelm Basse.

The U-boat spent most of her career as a training vessel. She sank or damaged no ships.

She was scuttled on 5 May 1945 at war's end near Wilhelmshaven.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-339 had a displacement of 769 t when at the surface and 871 t while submerged. She had a total length of 67.10 m, a pressure hull length of 50.50 m, a beam of 6.20 m, a height of 9.60 m, and a draught of 4.74 m. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2800 to 3200 PS for use while surfaced, two AEG GU 460/8–27 double-acting electric motors producing a total of 750 PS for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 m.

The submarine had a maximum surface speed of 17.7 kn and a maximum submerged speed of 7.6 kn. When submerged, the boat could operate for 80 nmi at 4 kn; when surfaced, she could travel 8500 nmi at 10 kn. U-339 was fitted with five 53.3 cm torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm SK C/35 naval gun, 220 rounds, and two twin 2 cm C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.

Service history
The boat's service life began with training with the 8th U-boat Flotilla from 25 August 1942. She was then transferred to the 11th flotilla on 1 March 1943. She was reassigned to the 22nd flotilla on 1 April.

Fate
The boat was seriously damaged by depth charges dropped from a British PBY Catalina of No. 190 Squadron RAF on 26 March 1943. As a result, she spent the rest of the war as a training vessel.

She was scuttled near Wilhelmshaven on 5 May 1945.