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.

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Creative#:

TOP22308215

Source:

達志影像

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RM

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須由TPG 完整授權

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No

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