This hidden space was used by local journalists to print underground newspapers.
Imagine the following: You're a Norwegian student and your landlord told you there's a secret room somewhere in the house...
Here's the drop-down door to the attic. You've been up there before and it's totally normal.
Exam time comes and you decide to take a break and go looking for this hidden room. You head up to the attic and poke around. You find nothing. So you just hang out.
Source: imgur.com
Until your friend accidentally pushes against something and the wall moves.
Says mYNDIG, the Redditor who discovered and posted this gem: "Took us damn long time, and was found by accident when one of the people I live with just stretched out and the wall moved."
You head in and find a tiny space filled with things from WW2.
Via: reddit.com