Upon arriving in Kristiania, Passepartout and Fogg notice that it is completely deserted. There are no signs of a battle or unrest. There is a hotel to stay in, but it is also completely abandoned and freezing cold.
Only after exploring do the pair uncover the truth; the people of Kristiania have relocated the entire city underground. Passepartout may meet the poet Arne Garborg, who explains that many Kristianians believe that Europe will soon descend into all-out war and shelling from airships will make subterranean accommodation the safest. They have set up a thriving market as well as developing a method of farming crops using phosphorescent seaweed.
After locating the real Kristiania, Passepartout and Fogg are able to stay in an underground hotel. There they can meet fellow explorer Otto Lidenbrock, who hopes to journey to the centre of the Earth. Passepartout may help him on his way by encouraging him to "try Iceland".