1912

29 Apr 1912: O 2 is moored next to the submarine tender Koningin Emma der Nederlanden and is visited by members of Onze Vloot.

1913

9 Nov 1913 - 19 Mar 1916: O 2 is under the command of .

World War I

The Netherlands is neutral.

The O 2 is based at Vlissingen.

1916

8 Aug 1916 - 23 Sep? 1918: O 2 is under the command of .

1918

23 Aug? 1918 - 17 Mar 1919: O 2 is under the command of Ltz. II  .

1919

26 Feb 1919 shortly after 21:15 hrs: The O 2 (outbound) and the sailing fishing boat Dirk Sch 219 (inbound) collide in the harbour of IJmuiden and both vessels sink. The submarine crew escapes through the tower hatch. At a later date the Bergingsvaartuig salvages both vessels.

The Sch 219 is a 72.06 bruto reg. ton sailing fishing boat that is owned by the Visscherij Maatschappij v/h Hub. Dirkzwager in‘s-Gravenhage. She is towed into the harbour by tugboat Gloria when the tugboat skipper spots the O 2. The skipper of the Gloria stops his engine and disengages the tow in order to prevent a collision. But it does not help and shortly the fishing boat and the submarine collide. The O 2 rams the Dirk Sch 219 in the starboard bow and gets stuck in her hull. The tugboat tries to tow both vessels to the south shore. But before the south shore is reached the fishing boat runs aground (she is sinking) and her crew is transferred to the tug. At a later date both vessels are raised and the submarine is pulled out of the hull of the fishing boat.

The Gloria only had a top-light on, which was about two meters above the deck. The O 2 did not have her top-lights on but she did have all the other necessary lights on.

To investigate the incident the 'Shipping Board of Inquiry' holds a public session on April 4th 1919. On 10 Apr 1919 they conclude that the skipper of the Gloria is to blame for this accident since the tugboat was only having her top-light on. They also conclude that if the Gloria had not slowed down, and remove the tow line, and had kept her speed the collision would probably not have happened.

17 Mar - 1 June 1919: O 2 is under the command of Ltz. II  Esq. .

1920

10 Dec 1920 - 1 Apr 1921: O 2 is under the command of Ltz. II  .

1921

1 Apr 1921 - 15 Mar 1922: O 2 is under the command of Ltz. II  .

1922

15 Mar - 4 May 1922: O 2 is under the command of Ltz. I  .

4 May 1922 - 9 June 1923: O 2 is under the command of Ltz. II  .

1922

9 June 1923 - 6 Oct 1924: O 2 is under the command of Ltz. II  .

1924

6 Oct 1924 - 3 July 1925: O 2 is under the command of Ltz. II  .

1925

3 July - 29 Oct 1925: O 2 is under the command of Ltz. II  .

1927

25 Apr 1927 - 29 Apr 1929: O 2 is under the command of . Since no references to H.G. Bron can be found the name should possibly be Ltz. II  .

1930

23 Apr 1930 - 1930: O 2 is under the command of Ltz. I  .

O 2 is decommissioned.

1930-1932

The O 2 is used as a training vessel for divers between 1930 and 1932?

According to other sources it was not until 1931 before she was equipped as a training submarine.