Minuteman ICBM launcher closure door designed to protect the missile underneath. The hexagonal concrete door is 3-1/2' thick and weighs 110 tons.
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Previously:
Minuteman II missile silo blast door - photo
Underground missile door mechanism - video
U.S. Navy submarine missile launch tubes - photo
Watertight door - GIF
Custom multi-point locking door - GIF
Vintage vault door - photo
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