Having access to various documents, he smuggled out copies which he delivered to the intelligence organisation XU.
From 1944 these included reports on shipments of German troops from harbors in the Oslofjord, until he had to flee to Sveden in 1945.
[1] After the Second World War, Johansen was recruited to Adm.T.P., the section for repatriation of German personnel, led by Vilhelm Evang.
[4]: 220–222 From 1977 he headed the Norwegian Intelligence Service section D, responsible for special information collecting and analysis.
He assumed the position of assisting director in 1992, and retired from the Norwegian Intelligence Service in 1994.