German submarine U-484

German submarine U-484 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II.

She carried out one patrol. She sank no ships.

She was sunk by British warships northwest of Ireland on 9 September 1944.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-484 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 Siemens-Schuckert GU 343/38–8 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-484 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), one 3.7 cm Flak M42 and two twin 2 cm C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.

Service history
The submarine was laid down on 27 March 1943 at the Deutsche Werke in Kiel as yard number 319, launched on 20 November and commissioned on 19 January 1944 under the command of Korvettenkapitän Wolf-Axel Schaefer.

She served with the 5th U-boat Flotilla from 19 January 1944 for training and the 3rd flotilla from 1 August for operations.

Patrol and loss
U-484's only patrol was preceded by a short trip from Kiel in Germany to Horten Naval Base (south of Oslo), in Norway. The patrol itself began with the boat's departure from Horten on 14 August 1944. She passed through the gap separating Iceland and the Faroe Islands and was shortly afterwards attacked and sunk by depth charges dropped by two British warships, the corvette HMS Portchester Castle (K362) and the frigate HMS Helmsdale (K253) on 9 September 1944.

Fifty-two men went down with U-484; there were no survivors.

Previously recorded fate
Sunk on 9 September 1944 by depth charges from two Canadian warships, the corvette HMCS Dunver (K03) and the frigate HMCS Hespeler (K489). This attack was on a non-submarine target.