Blast Doors

The two 23-ton blast doors at the entrance inside the Cheyenne Mountain Complex are made of steel and can take up to 20 seconds to close with the assistance of hydraulics. If the hydraulics were to fail, the military guards stationed in the tunnel can close the doors in 40 seconds. (U.S. Air Force photo/Staff Sgt. Andrew Lee)

PHOTO BY: Andrew Lee, SSgt., USAF
VIRIN: 160107-F-NL936-9445.JPG
FULL SIZE: 3.76 MB
Additional Details

CAMERA

NIKON D800

LENS

24.0-70.0 mm f/2.8

APERTURE

28/10

SHUTTERSPEED

1/13

ISO

160

IMAGE IS PUBLIC DOMAIN

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This photograph is considered public domain and has been cleared for release. If you would like to republish please give the photographer appropriate credit. Further, any commercial or non-commercial use of this photograph or any other DoD image must be made in compliance with guidance found at https://www.dimoc.mil/resources/limitations, which pertains to intellectual property restrictions (e.g., copyright and trademark, including the use of official emblems, insignia, names and slogans), warnings regarding use of images of identifiable personnel, appearance of endorsement, and related matters.

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