Diesel fuel reservoir
18 of 23 from Photos: Inside Cheyenne Mountain, America's Fortress
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Deep inside the complex is a reservoir of diesel fuel that has a capacity of 510,000 gallons, though it is not filled all the way. The fuel is floated on several feet of water in order to keep it from seeping through the granite.
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June 27, 2009 6:00 AM PDT
Photo by: Daniel Terdiman/CNET
