He joined Norwegian Independent Company 1 in 1942 where he later became an ensign Aubert was the first German prisoner tortured to death at Grini. Under the cruel torture he revealed nothing and he thus saved the lives of many he had worked with. Due to his leadership skills, he was often chosen to perform the most demanding missions carried out by the group.
When the Norwegian Royal Family returned to Norway after the war, Aubert served as a bodyguard.
After the war Aubert lived a restless and tense life. He died in Oslo in 1956 at the age of 45 and is buried at the Vestre gravlund cemetery.
Norwegian Independent Company 1]
Aubert soon became one of the key members of the sabotage group Oslogjengen, which was under the command of Gunnar Sønsteby. In early May 1945 Aubert among other members of Oslogjengen secured the archives in the Department of Justice, which revealed the actions the Nazis in Norway during the war.