German submarine U-984

German submarine U-984 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 7 September 1942 by Blohm & Voss, Hamburg as yard number 184, launched on 12 May 1943 and commissioned on 17 June 1943 under Oberleutnant zur See Heinz Sieder.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-984 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 Brown, Boveri & Cie GG UB 720/8 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-984 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 one twin 2 cm C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.

Service history
The boat's career began with training at 5th U-boat Flotilla on 17 June 1943, followed by active service on 1 August 1944 as part of the 9th Flotilla for the remainder of her service.

On 22 January 1944, Maschinenobergefreiter Hermann Keller was lost overboard in the North Atlantic.

On 8 June 1944, U-984 was bombed by an unidentified Allied aircraft and was sufficiently damaged to force a return to base on 9 June

In 5 patrols she accounted for the total loss of 3 merchant ships, for a total of, one warship total loss (1,300 tons) and damaged one other merchant ship.

Wolfpacks
U-984 took part in four wolfpacks, namely:
 * Rügen (14 – 26 January 1944)
 * Stürmer (26 January – 3 February 1944)
 * Igel 1 (3 – 17 February 1944)
 * Dragoner (22 – 27 May 1944)

Fate
Sunk on or about 2 August 1944 in the English Channel south-west of Brighton in position 50.0622°N, -0.53997°W by unknown cause. All hands were lost.

Previously recorded fate
U-984 was sunk on 20 August 1944 in the North Atlantic in the Bay of Biscay in position 48.26667°N, -5.55°W, by depth charges from Canadian destroyers HMCS Ottawa (H31), HMCS Kootenay (H75) and HMCS Chaudiere (H99). All hands were lost. U-984 has subsequently been positively identified as the U-boat sunk on or about 2 August 1944 in the English Channel south-west of Brighton, in position 50.03.732N, 00.32.398W, by unknown cause, with presently no plausible explanation for its loss in the wreck position.