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自从二次大战以来,世界上许多国家建造了地下防护设施。四十年代的纳粹德国、美国、英国、瑞典、挪威等,都有大量的地下工程。战后,在一些工业发达和人口稠密的国家,又陆续建立了许多地下工程,例如地下铁道、地下机库、地下油库和仓库等等。所谓“地下工程”,包括建在地下的建筑物和利用天然岩洞或人工开凿的岩洞。瑞典的地下工程在世界上是比较著名的。它不仅有军事设施,也有民用建筑;不仅可在战时使用,更可在和平时期广泛使用。瑞典人口800多万,物产富饶,
Since World War II, many countries in the world have built underground protection facilities. In the forties of Nazi Germany, the United States, Britain, Sweden, Norway, there are a large number of underground works. After the war, many underground projects such as underground railways, underground hangars, underground oil depots, warehouses and so on were successively established in some industrially developed and populous countries. The so-called “underground engineering”, including underground buildings and the use of natural caves or artificially excavated caves. Underground works in Sweden are more famous in the world. It not only has military facilities, but also civilian buildings; it can be used not only in wartime, but also in peacetime. More than 800 million people in Sweden, rich products,