Air-raid shelters, also referred to as bomb shelters or underground bunkers, are structures designed to provide protection from enemy bombings during times of war. These shelters come in various shapes and sizes, ranging from small, underground tunnels to large, reinforced concrete structures. Other synonyms for air-raid shelters include fallout shelters, blast shelters, and safe rooms. Fallout shelters are designed to provide protection from radioactive fallout following a nuclear explosion. Blast shelters are typically built with reinforced walls and roofs to withstand the force from an explosion. Safe rooms provide protection from intruders and natural disasters such as hurricanes or tornadoes. Whatever the name, these structures are meant to offer peace of mind and protection during times of uncertainty.