German submarine U-1305

German submarine U-1305 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II.

She was ordered on 1 August 1942, and was laid down on 30 July 1943 at Flensburger Schiffbau-Gesellschaft, Flensburg, as yard number 498. She was launched on 11 July 1944 and commissioned under the command of Oberleutnant zur See Helmuth Christiansen on 13 September 1944.

Design
German Type VIIC/41 submarines were preceded by the heavier Type VIIC submarines. U-1305 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, an overall 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 460/8-276 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-1305 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 an anti-aircraft gun. The boat had a complement of between forty-four and fifty-two.

Service history
On 10 May 1945, U-1305 surrendered at Loch Eriboll, Scotland. She was later transferred to Loch Ryan, Scotland on 30 May 1945.

Post war service
The TNC allocated U-1305 to the Soviet Union. On 4 December 1945, she arrived in Libau, Latvia, as British N-class N25. On 13 February 1946, the Soviet Navy allocated her to the Baltic Fleet. She was renamed S-84 on 9 June 1949 then sent to the reserve fleet on 30 December 1955. S-84 went to the Northern Fleet as a test hulk and was later sunk in the Barents Sea on 10 October 1957, during an atomic bomb test off of Novaja Zemlja.

The wreck now lies approximately at 70.703°N, 54.6°W.