Sweden's government has urged its citizens to prepare in the event of an attack from Russia. Nils, 30, has enough to survive alone, without electricity, for a week.

He ferments, dries or salts his food to better preserve it. He also stocks games, books and an acoustic guitar to “know how to keep busy and have fun if you're stuck at home for a whole week,” he jokes. In 2018, when the Swedish state sent a brochure explaining to the population what to do in theevent of war, Nils and a friend transformed their basement into a real bunker.