Several meters underground, in the center of the capital, there is a secret room. Dagbladet heads down to see what's hiding – and finds the mysterious tunnels that will lead to the castle.

Underground: We will pass through heavy iron doors and four meters of concrete to see the underground rooms. Warden Magne Elseberg (59) reveals what he thinks is hiding here. Photo: Kristin Sforte/Dagbladet
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