In many countries, fallout shelters are often just makeshift spaces, far from being a comprehensive part of civil defense. In contrast, Switzerland has a unique and extensive network of fallout shelters, designed to protect every one of its citizens in the event of a nuclear attack. Beneath its picturesque landscapes lie over 370,000 shelters, a world record that originated from Cold War-era planning to shield the population from radioactive fallout. This vast infrastructure, built during a time of heightened global tension, reflects a strategic approach to civil protection that continues to intrigue and raise questions today, especially as international relations grow more complex. When thinking about places that could offer refuge in a nuclear conflict, countries like Australia or New Zealand often come to mind, thanks to their geographical isolation and natural resources. However, for a more dramatic and immersive experience, one might look to Switzerland. Known for its military neutrality, this small country of about 9 million people holds the world record for the most fallout shelters. This statistic might seem surprising given its policy of non-involvement in international conflicts, but it highlights a unique approach to civil defense. During the Cold War, when the world teetered on the brink of nuclear war, Switzerland had no reason to expect direct military involvement. Yet, its leaders recognized that radioactive fallout from a nuclear strike in Europe could still pose a serious threat to the country. This understanding led to the creation of a national civil defense strategy centered on building sturdy, affordable shelters that could protect the population during the critical period following a nuclear attack. The Swiss Federal Office of Civil Protection described this effort as a "visionary and unique concept," emphasizing the country's commitment to preparedness even in the absence of direct military threats. Among the most impressive of these shelters is the Sonnenberg bunker, constructed in the 1970s. It was designed to hold 20,000 people—about a third of the population of Lucerne at the time. This scale of infrastructure illustrates Switzerland's ambitious goal: to provide a comprehensive system that could protect entire communities rather than just a select few. However, these shelters were not intended for long-term survival. The diesel reserves required to maintain power and ventilation systems were limited to a few weeks, meaning that while they could offer immediate protection, they were not designed for sustained living conditions. This highlights a key aspect of Swiss civil defense: to ensure survival through the most dangerous phase of a nuclear conflict, rather than to support long-term habitation underground.