28 June 1918

Sunk off Irish coast by UB73

On 28th June 1918 whilst on patrol in the North Sea D6 was sunk by UB73.

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Lost In North Sea (unknown cause)

On the morning of 14th July 1918 HMS E34 left Harwich to lay mines off Vlieland. She was lost with all hands on the 19th. The exact cause of her loss is unknown.

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3 October 1918

Sunk north of Terschelling by gunfire from German ships

On the morning of 3rd October 1918 HMS L10 was in the vicinity of a German convoy, which had, the previous night, been attacked by British Destroyers. That afternoon a number of German ships were spotted searching the area for survivors and L10 signalled her intention of attacking the German squadron, which consisted of the Destroyers S33 and S34 and two torpedo boats heading from Zeebrugge to Germany.

S34 struck a mine with the result that the other ships were forced to ignore the danger of mines to rescue the sinking destroyer’s crew. L10 moved in and fired a torpedo at S33. S33 was severely damaged but initial thoughts of another mine were dispelled when L10’s conning tower broached the surface. S33 managed to bring her guns to bear and sank the submarine through persistent shelling.

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October 1918

Sank off Immingham after collision with HM destroyer

October 1918 following a main motor failure C12 was driven by the tide against a destroyer lying at the Eastern Jetty, Immingham and was holed and sank.

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15 October 1918

Sunk in error off Blyth by Q Ship HMS Cymric

On 15th October 1918 HMS J6 was lying on the surface outside Blythe. The Q-ship Cymric was also in the area and had already encountered two British submarines that day. At 1600 a third submarine was spotted closing to have what the Cymric thought was a good look before attacking. The Cymric at once went to action stations believing the submarine to be the German U-boat U6; As shells poured into the submarine the signalman attempting to hoist a recognition signal was killed. J6 attempted to lose the Q-ship by entering a fog bank Cymric followed and found the submarine settling in the water. It was only when survivors were picked up that the mistake became clear.

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1 November 1918

Lost in North Sea (unknown cause)

In October 1918 G7 set sail for a patrol in the North Sea. Communications were lost on the 23rd and she was declared lost a week later.

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22 November 1918

Wrecked off Harwich during Fog

Recalled on 22nd November from a patrol off Dogger Bank HMS G11 ran ashore, in thick fog, near Harwich and was unable to be saved.

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4 June 1919

Possibly sunk near Kronstadt by Soviet Warship

On 4th June 1919 while patrolling in the Baltic, during the war against the Soviets, L55 was attacked by two Soviet destroyers and sunk by heavy shellfire.

In August 1928 the Soviets announced that L55 had been raised. The Admiralty requested that the remains of her crew be returned. These were collected by a merchant ship before being transferred to HMS Champion. On 7th September 1928 the crew of L55 were finally laid to rest in a single grave at the Royal Naval Cemetery, Haslar.

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18 October 1919

Sank at Blyth when holed by propeller of HMS Vulcan

Sunk alongside at Blyth on 18th October 1919 after being holed in a collision, by the propeller of HMS Vulcan.

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20 January 1921

Sank off Isles of Scilly (unknown cause)

On 20th January 1921 HMS K5 sailed from Torbay as part of a fleet bound for Spain, which included the Cruiser Inconstant and Submarines K8, K9, K15 and K22. It was decided to conduct a mock battle in the Bay of Biscay and the vessels split up to take their positions. A signal was received from K5 that she was diving, but she failed to reappear at the end of the exercise. An hour before dusk a battery cover from a K boat was recovered and the next morning a sailor’s ditty box was found - the last trace of K5. It is believed an accident caused K5 to exceed her maximum diving depth.

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25 June 1921

Sank of Portsmouth

On the 25th June 1921 K15 was moored alongside the light cruiser HMS Canterbury, in the tidal basin at Portsmouth. Most of the crew were on leave when a watch keeper discovered that the submarine was sinking, with the stern already awash. The watch were quickly roused and scrambled aboard the Canterbury. The submarine slowly submerged amid streams of bubbles. The accident was caused by hydraulic oil expanding in the hot weather and contracting as the temperature dropped causing a loss of hydraulic pressure and causing vents to open.

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23 March 1922

Sank off Gibraltar following collision with HMS Versatile

As part of the 3rd Submarine Flotilla H42 had spent Christmas 1921 in Portsmouth before sailing in January 1922 for exercises in the Mediterranean. H42 surfaced just off Gibraltar 120 yards in front of the destroyer HMS Versatile who at that time was cruising at 20 knots. The Destroyer was unable to take avoiding action and ploughed into the submarine almost slicing her in two.

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18 January 1923

Sank in Hong Kong Harbour during a typhoon

HMS L9 broke adrift from a buoy in Hong Kong during a typhoon. The submarine struck a merchant ship and damaged a dockyard wall before foundering.

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