Rows of mammoth springs,coiled from three-inch diameter steel,support the 11 buildings of NORAD's (North American Air Defense Command) mountain complex. More than 900 springs,weighing a ton each,cushion the buildings,people and delicate electronic equipment they operate against jarring nuclear blasts or earthquakes | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Omikron |
Bildgröße: | 4689 px × 3727 px |
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