[2] As a student, Munck made several trips to Greenland,[1] beginning with an expedition led by Ejnar Mikkelsen to Scoresbysund in 1924.

[2] Munck was married to Kirsten Munk, the sister of Danish resistance activist Jutta Graae.

[1][2] Business, travel and stays abroad created a huge circle of friends for him, also because his keen interests, which ranged from politics to technology to everyone's daily life, quickly connected him to everyone he came into contact with.

[1] Munck developed an intelligence network,[2] passing on information to the British, including the Special Operations Executive (SOE) organization (22 July 1940 – 15 January 1946) after he met Sir Charles Hambro in October 1940.

[2] Munck became a more effective operative, working with Danish intelligence officers, after the SOE placed a contact person, Ronald Turnbull, in Stockholm in February 1941.

[2] Munck helped John Christmas Møller escape in 1942, after which Swedish people became more involved in supporting aid for Danes.

In 1942, Berlingske Tidende was forced by its German side of the newspaper to fire Munck, who remained in Stockholm as a freelance journalist.

[1][2] Munck was also involved in setting up ways for Danish refugees to cross the Øresund and escape to Sweden.