O 8. Date and place unknown

1915

? 1915: H 6 is laid down at the Canadian Vickers & Co shipyard in Montreal (Canada).

Aug 1915: H 6 is launched.

10 June 1915: H 6 is completed.

? 1915: H 6 is commissioned to the British Royal Navy.

H 6 crosses the Atlantic under her own power.

H 6 is attached to the Harwich Submarine Force (8th flotilla) of the British Royal Navy.

1916

19 Jan 1916: H 6 strands in the Friesche Zeegat off Schiermonnikoog (The Netherlands). The British crew is transferred to a British steam sloop by means of two of the Hr.Ms. Noord Brabant class sloops. As England is fighting World War I  and the Dutch government is neutral the English submarine is interned.

Other sources report: On 18th January H6 ran aground off the island of Schiermonnikoog. A boat from the destroyer Firedrake brought off 2 officers, 10 men and the ship's papers. The remainder of the crew, including C.O., were rescued by the Dutch and interned at Groningen. 

22 Feb 1916: Bad weather delays the salvage operation, but the H 6 is set afloat once again on the 22nd of February.

23 Feb 1916: H 6 arrives in Den Helder (home ports of the Dutch Navy).

4 May 1916 or 1917: The Royal Netherlands Navy and the British Royal Navy agree on the transfer of the H 6 to the Royal Netherlands Navy.

H 6 is refitted at the Rijkswerf shipyard in Den Helder. The technicians use the knowledge gained by the transfer of the German submarine to the Royal Netherlands Navy.

1917

4 May 1917 - 2 Sep 1918: H 6 is under the command of Ltz. I  .

7 May 1917: H 6 is commissioned to the Royal Netherlands Navy as O 8.

1917: The Zeiss periscope of the M 1 is dismantled and installed on the O 8. M 1 in return receives the O 8's periscope.

1918

2 Sep - 24 Sep1918: O 8 is under the command of Ltz. II  .

24 Sep1918 - 14 Mar 1919: O 8 is under the command of .

1919

14 Mar 1919 - 25 Feb 1920: O 8 is under the command of Ltz. II  .

1920

25 Feb 1920 - 5 May 1922: O 8 is under the command of Ltz. II  / Ltz. I  .

1921

2 May - 12 May 1921: O 8 and O 6 make a trip to Le Havre (France).

Oct 1921: O 8 sinks in the submarine dry-dock at Willemsoord (Den Helder naval base), but she is successfully salved by Bergingsvaartuig.

O 8 is under repairs until Sept 1922.

1922

21 Aug 1922 - 12 Oct 1923: O 8 is under the command of Ltz. I  .

1923

12 Oct 1923 - 1 Sep 1925: O 8 is under the command of Ltz. II  Esq. .

1925

10 June - 4 Aug 1925: O 8, K XI, Jacob van Heemskerck, Tromp, Z 3 and Z 5 are part of a squadron trip to the Baltic, which visits the ports of Lithuania, Letland, Estonia and Finland.

4 Aug 1925: The ships arrive in Nieuwediep (Den Helder).

1926

22 May 1926 - ?: O 8 is under the command of Ltz. II  .

1930

28 June - 10 July 1930: O 8, O 9, Jacob van Heemskerck, Z 5 and Z 7 sail from Nieuwediep (Den Helder) to Edinburgh (Scotland).

1931

1 Jul - 7 Aug 1931: O 9, O 8, O 10, Jacob van Heemskerck, Z 7 and Z 8 sail from Nieuwediep (Den Helder) to the Baltic for exercises.

1939

25 Aug 1939 - 14 May 1940: O 8 is under the command of Ltz. II  .

Dec 1939: O 8 replaces O 7 as the training boat.

1940

10 May 1940: Germany attacks the Netherlands.

11 May 1940: O 8 is decommissioned.

14 May 1940: The O 8 is 'destroyed' (it is unknown to which extent, probably only little damage) by yard personnel, she is too old to flee to the U.K.

15 May 1940: Invading German forces capture the O 8 intact.

Nov 1940 - Apr 1941: O 8 is commissioned to the German Navy as U-D1 and attached to the 1st Flotilla in Kiel, she is used as a trial boat.

21 Nov 1941 - May 1941: U-D1 is under the command of Krvkpt H. Rigele.

1941

May - Aug 1941: U-D1 is attached to the 3rd Flotilla in Kiel (Germany) and is used as a trial boat.

Aug - Dec 1941: U-D1 is attached to the 5th Flotilla in Kiel (Germany) and is used as a trial boat.

May - Nov 1941: U-D1 is under the command of Kptlt F. Schäfer.

Nov 1941 - Dec 1942: U-D1 is under the command of Krvkpt F. Venier.

Dec 1941 - July 1943: U-D1 is attached to the U-Abwehrschule in Gotenhafen (Germany) and is used as a school boat.

7 Dec 1941: The USA declares war on Japan after Japanese forces attack Pearl Harbour. Approximately 7 hours after the attack the Netherlands also declares war on Japan.

14 Dec 1941: Japanese planes bomb Tarempah (Anambas Islands) which is Netherlands East Indies territory.

27 Dec 1941: Japanese invaders occupy Tambelan Islands, Dutch territory, between Borneo and Singapore.

1942

Dec 1942 - May 1943: U-D1 is under the command of Kptlt W. Ketelsen.

1943

May 1943 - 23 Nov 1943: U-D1 is under the command of Oblt F. Weidner.

July - Nov 1943: U-D1 is attached to the 5th Flotilla in Kiel (Germany) and is used as a school boat.

23 Nov 1943: U-D1 is decommissioned.

1945

3 May 1945: U-D1 is scuttled in Kiel.

8 May 1945: Germany surrenders.

15 Aug 1945: Japan surrenders.

The wreck of U-DI is broken up.

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