You receive an emergency alert: "BALLISTIC MISSILE THREAT INBOUND. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL." What do you do? How do you think your neighborhood will react? What memes be on Lemmy?
There is "space for around seven million people" and Sweden's population is about 10.6 million, and the availability of shelters seems to match the population distribution pretty closely. You could at least let your neighbors know that they can have your space in a shelter (since there might be about 3.6 million people who won't fit in shelters), or show up anyway in order to help carry away any materials that were being stored in a shelter in peacetime, or to help get food or water into a shelter.