Word: blastproof
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Dates: during 1960-1969
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...underground fortress is an entrance portal, the ground-level doors over three Titan I silos, and silos containing 100-ft.-long radio antennas that rise along with the missiles and guide them on their way. At the concreted entrance tower, 13 steps spiral downward to a portal and a blastproof revolving door. Behind the door, 69 steps drop underground to a cool, yellow-painted steel tunnel 1,687 ft. long and lined with cables, pipes and tanks for water, diesel fuel and liquid oxygen...
News from Home. Their temporary home is a "molehole" adjacent to the Christmas Tree. It is a square, white (for thermal reflection) concrete structure entered through green corrugated steel tubes. It is partially blastproof (most of the 72 duty flight and ground crewmen live in the underground section) and completely soundproof. The area is guarded at the barbed-wire fences by police dogs and armed sentries. The guards even have a secret code-by voice or glance-to cover the possibility that an airman might enter in the company of a saboteur who has an unseen...