[1] The cave is located on the island of Halsnøy, 1.5–2 kilometres inland, on the top of a small clearing surrounded by forests, and cannot be seen from low ground, which made it an ideal hiding place for the resistance.
[2] Very little concrete information of its use prior to the 1930s exists, but historians have speculated that the small clearing might have been a housing location during the 11th century–13th century.
As the cave was part of larger farmlands in the area, it was used as a natural shelter for animals in the decades before the war.
During a particular cold winter, the batteries used for the radio were ruined by frost, and so Hauge and his fellow resistance members had to trade food and supplies for a new one, nearly revealing their involvement.
The locals also use the cave frequently for outdoor arrangements, as well as an annual war memorial service held on the weekend closest to May 8, which is Liberation Day in Norway.