Why are there two doors at one door in the basement where there are people guarding the drawings?

Yes, he divided the civil air defense basement into peacetime and wartime. According to the different protection requirements, functions and layout, it can be divided into "peacetime" and "wartime". For example, "peacetime" is an underground garage. In addition to the necessary columns, partition walls and fire doors for dividing fire zones, the basement is relatively empty and can meet the parking requirements. As a civil air defense project, "protection unit" and "anti-explosion unit" will be divided according to the relevant civil air defense design specifications in wartime, and anti-explosion partition walls should be set between different "anti-explosion units" in wartime to avoid possible damage affecting personnel safety. The explosion-proof partition wall can be composed of precast reinforced concrete members or piled up with sandbags. For specific requirements, please refer to civil air defence basement Design Code. Obviously, too many partitions are useless to the garage and take up space. Therefore, the basement of civil air defense combined with peacetime and wartime can be divided into "peacetime and wartime". In the design of civil air defense basement, the measures of peacetime and wartime conversion can be taken according to the requirements of the code, and the workload of conversion in the face of war should be coordinated with the strategic position of the city to meet the local wartime human and material conditions.