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Show I - x " NrJ , " -Vtl"r- 'TV- 1 SALT MINE under metropolitan Detroit, Michigan, offers a unique civil defense opportunity for a large target city to provide both blast and fallout shelter for a substantial number of its citizens with a minimum amount of additional excavation. The mine second largest larg-est rock salt mine In the world is 1,137 feet under the surface. It would need more equipment and access ramps or elevators to serve as a mass shelter from attack. (photo courtesy international Salt Co.i |