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flag Polo, Missouri's 1960-built 10,000 sq ft underground bunker highlights the modernization from panic rooms to large-scale personal safety measures.

flag The article highlights the evolution of personal safety measures, from panic rooms to modernized underground bunkers. flag Panic rooms became popular in the late 20th and early 21st centuries as a response to concerns about personal safety and security. flag These secure spaces, also known as safe rooms, provided a safe retreat during emergencies such as home invasions or burglaries. flag However, the ultimate in personal safety is now an underground bunker. flag One such bunker, located in Polo, Missouri, spans 10,000 square feet and cost 4.5 million dollars to build in the 1960s.

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