After a few photos, Kristoffersen leads the way back to the surface. He locks and wedges the doors shut with care, reminding me that he’s the man with the keys: “Not even the prime ministers of the Nordic countries have a set.” So in the worst-case scenario, I ask, how will the last people on earth gain access to their future?
“With a crowbar and a sledgehammer,” he replies, “I think they’ll manage.”
