Excavation of North American Aerospace Defense Command (NORAD) combat operation center (COC) on Cheyenne Mountain, in Colorado, United States. Ore car comes out of tunnel. It moves on track. Trees on either side of the track. Engineers talk. Bulldozer loads dirt in trailer during the mucking out operation. Man marks drilling locations with spray paint. Workmen insert dynamite into a hole during rock drilling. Arc marked blasting pattern on wall. Men make wire connections. Scaling operation. Dynamite blasts. Bulldozer clears the dirt after blast and unloads it in trailer. Electric ore car dumps rock over side of mountain.
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