HMS K5
Encyclopedia
HMS K5 was one of the K-class
British K class submarine
The K class submarines were a class of steam-propelled submarines of the Royal Navy designed in 1913. Intended as large, fast vessels which had the endurance and speed to operate with the battle fleet, they gained notoriety, and the nickname of Kalamity class, for being involved in many accidents....

 submarine
Submarine
A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

s that served in the Royal Navy
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 from 1917-1921. She was lost with all hands when she sank en route to a mock battle in the Bay of Biscay
Bay of Biscay
The Bay of Biscay is a gulf of the northeast Atlantic Ocean located south of the Celtic Sea. It lies along the western coast of France from Brest south to the Spanish border, and the northern coast of Spain west to Cape Ortegal, and is named in English after the province of Biscay, in the Spanish...

.

War service

At the end of the war in 1918, K5 was part of the 12th Submarine Flotilla
Flotilla
A flotilla , or naval flotilla, is a formation of small warships that may be part of a larger fleet. A flotilla is usually composed of a homogeneous group of the same class of warship, such as frigates, destroyers, torpedo boats, submarines, gunboats, or minesweepers...

 based at Rosyth
Rosyth
Rosyth is a town located on the Firth of Forth, three miles south of the centre of Dunfermline. According to an estimate taken in 2008, the town has a population of 12,790....

, along with six others of the K-class.

Loss

K5 left Torbay
Torbay
Torbay is an east-facing bay and natural harbour, at the western most end of Lyme Bay in the south-west of England, situated roughly midway between the cities of Exeter and Plymouth. Part of the ceremonial county of Devon, Torbay was made a unitary authority on 1 April 1998...

 on 19 January 1921 with the , , and for a mock battle in the Bay of Biscay.

The submarine was commanded by an experienced officer, Lieutenant Commander
Lieutenant Commander
Lieutenant Commander is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander...

 John A Gaimes
John Gaimes
Lieutenant-Commander John Austin Gaimes, DSO, was a submarine commander for the Royal Navy. He died 20 January 1921, at the age of 33, when the HMS K5 sank with the loss of all hands during a mock battle in the Bay of Biscay.- History of service :...

, DSO
Distinguished Service Order
The Distinguished Service Order is a military decoration of the United Kingdom, and formerly of other parts of the British Commonwealth and Empire, awarded for meritorious or distinguished service by officers of the armed forces during wartime, typically in actual combat.Instituted on 6 September...

, RN
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

, but had a new crew. The other officers on board were Lieutenant
Lieutenant
A lieutenant is a junior commissioned officer in many nations' armed forces. Typically, the rank of lieutenant in naval usage, while still a junior officer rank, is senior to the army rank...

 F Cuddeford, Engineer-Lieutenant E Bowles, Acting
Brevet (military)
In many of the world's military establishments, brevet referred to a warrant authorizing a commissioned officer to hold a higher rank temporarily, but usually without receiving the pay of that higher rank except when actually serving in that role. An officer so promoted may be referred to as being...

 Engineer-Lieutenant G Baker, Lieutenant B Clarke and Acting Lieutenant R Middlemist. The full complement included 51 other ranks on board.

All 57 hands were lost on 20 January about 120 mi (193.1 km) south-west of the Isles of Scilly
Isles of Scilly
The Isles of Scilly form an archipelago off the southwestern tip of the Cornish peninsula of Great Britain. The islands have had a unitary authority council since 1890, and are separate from the Cornwall unitary authority, but some services are combined with Cornwall and the islands are still part...

. She had signalled that she was diving but she did not surface at the end of the exercise. After a battery cover and a sailor's "ditty box" were recovered, it was presumed that she had somehow gone past her maximum depth.

On return from her exercises in the Mediterranean in 1922, and the rest of the fleet dropped wreaths and held a memorial service where K5 had gone down.

Problems with the K-class

Retired Rear-Admiral S.S. Hall wrote in The Times
The Times
The Times is a British daily national newspaper, first published in London in 1785 under the title The Daily Universal Register . The Times and its sister paper The Sunday Times are published by Times Newspapers Limited, a subsidiary since 1981 of News International...

 (24 January 1921, p. 10): "...it may be taken as certain that the loss of the vessel was due to some delay to checking the downward momentum gained by the vessel being overtrimmed in diving, either by admitting compressed air too slowly to too many tanks at one time, to tanks only partially full, or to a sea connexion being closed prematurely."

The waters where the battle exercises were taking place were so deep that the vessel would have been crushed, losing control due to the intake of water. Admiral Hall wrote that it was "not clear why the 'K' class should be taken for cruises in the Atlantic in winter." He describes the submarines as 'freaks' that were designed especially for the conditions of the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 during World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. "The high surface speed necessitates great length, and the further complication of steam demands very large openings for funnels and air intakes to boiler rooms. These have always been a source of great anxiety in bad weather or in rapid diving."

suffered a similar fate during her acceptance trials, when she foundered with the loss of 32 of those on board. The cause of the incident was related to the openings Hall refers to.
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