# SM U-84

SM U-84 was one of the 329 submarines serving in the Imperial German Navy (Kaiserliche Marine) in World War I. U-84 was engaged in the naval warfare and took part in the First Battle of the Atlantic.
Initially U-81 to U-83 had one 10.5 cm gun with 140-240 rounds. U-84 - U-86 on the other hand had two 8.8 cm guns. In 1917 U-84 - U-86 were refitted with a single 10.5 cm gun (240 rounds)

## Design

Type U 81 submarines were preceded by the shorter Type UE I submarines. U-84 had a displacement of 808 tonnes (795 long tons) when at the surface and 946 tonnes (931 long tons) while submerged. She had a total length of 70.06 m (229 ft 10 in), a pressure hull length of 55.55 m (182 ft 3 in), a beam of 6.30 m (20 ft 8 in), a height of 8 m (26 ft 3 in), and a draught of 4.02 m (13 ft 2 in). The submarine was powered by two 2,400 metric horsepower (1,800 kW; 2,400 shp) engines for use while surfaced, and two 1,200 metric horsepower (880 kW; 1,200 shp) engines for use while submerged. She had two propeller shafts. She was capable of operating at depths of up to 50 metres (160 ft).
The submarine had a maximum surface speed of 16.8 knots (31.1 km/h; 19.3 mph) and a maximum submerged speed of 9.1 knots (16.9 km/h; 10.5 mph). When submerged, she could operate for 56 nautical miles (104 km; 64 mi) at 5 knots (9.3 km/h; 5.8 mph); when surfaced, she could travel 11,220 nautical miles (20,780 km; 12,910 mi) at 8 knots (15 km/h; 9.2 mph). U-84 was fitted with four 50 centimetres (20 in) torpedo tubes (two at the bow and two at the stern), twelve to sixteen torpedoes, and one 10.5 cm (4.1 in) SK L/45 deck gun. She had a complement of thirty-five (thirty-one crew members and four officers).

### Previously recorded fate

U-84 was originally though to have been rammed, depth charged and sunk by PC62 in St George's Channel and sunk at 51°53′N 5°44′W﻿ / ﻿51.883°N 5.733°W﻿ / 51.883; -5.733.

## Summary of raiding history

| Date | Name | Nationality | Tonnage | Fate |
| 14 December 1916 | Aamot | Norway | 1,362 | Captured as prize |
| 18 December 1916 | Malcolm | Sweden | 2,100 | Captured as prize |
| 9 January 1917 | Alexandrian | United Kingdom | 4,467 | Damaged |
| 10 January 1917 | Bergenhus | Norway | 3,606 | Sunk |
| 12 January 1917 | Auchencrag | United Kingdom | 3,916 | Sunk |
| 15 January 1917 | Kinpurney | United Kingdom | 1,944 | Sunk |
| 15 January 1917 | Omsk | Denmark | 1,574 | Sunk |
| 20 January 1917 | Bulgarian | United Kingdom | 2,515 | Sunk |
| 20 January 1917 | Neuquen | United Kingdom | 3,583 | Sunk |
| 17 February 1917 | Bayonne | France | 2,589 | Sunk |
| 17 February 1917 | Romsdalen | United Kingdom | 2,548 | Sunk |
| 18 February 1917 | Berrima | United Kingdom | 11,137 | Damaged |
| 18 February 1917 | Hunsworth | United Kingdom | 2,991 | Damaged |
| 18 February 1917 | Juno | Norway | 2,416 | Sunk |
| 18 February 1917 | Valdes | United Kingdom | 2,233 | Sunk |
| 21 February 1917 | Dukat | Norway | 1,408 | Sunk |
| 22 February 1917 | Invercauld | United Kingdom | 1,416 | Sunk |
| 13 April 1917 | Argyll | United Kingdom | 3,547 | Sunk |
| 13 April 1917 | Lime Branch | United Kingdom | 5,379 | Damaged |
| 18 April 1917 | Cragoswald | United Kingdom | 3,235 | Sunk |
| 18 April 1917 | Rowena | United Kingdom | 3,017 | Sunk |
| 19 April 1917 | Elswick Manor | United Kingdom | 3,943 | Sunk |
| 20 April 1917 | Malakand | United Kingdom | 7,653 | Sunk |
| 1 July 1917 | Bachi | Spain | 2,184 | Sunk |
| 1 July 1917 | Demerara | United Kingdom | 11,484 | Damaged |
| 4 July 1917 | Goathland | United Kingdom | 3,044 | Sunk |
| 7 July 1917 | Condesa | United Kingdom | 8,557 | Sunk |
| 7 July 1917 | Oxø | Norway | 831 | Sunk |
| 12 August 1917 | Ursus Minor | Norway | 623 | Sunk |
| 13 August 1917 | HMS Bergamot | Royal Navy | 1,290 | Sunk |
| 24 November 1917 | Actaeon | United States | 4,999 | Sunk |
| 1 December 1917 | Antonios Stathatos | Greece | 2,743 | Sunk |
| 2 December 1917 | Birchgrove | United Kingdom | 2,821 | Sunk |
| 9 January 1918 | Bayvoe | United Kingdom | 2,979 | Sunk |
| 10 January 1918 | Cardiff | United Kingdom | 2,808 | Damaged |
| 11 January 1918 | Mereddio | United Kingdom | 3,069 | Sunk |
| 12 January 1918 | Chateau Laffite | France | 1,913 | Sunk |
| 17 January 1918 | Messidor | United Kingdom | 3,883 | Damaged |