Titan II's silo door is 43 feet (12.5 m) long, 64 feet (19.5 m) wide, and 5 feet (1.5 m) thick at the center. It was designed to withstand a shockwave of 300 psi (21 kg/cm2). The exact weight is unknown, but documents from 1962 list the average weight as 725 tons (657 metric tons). The door was opened with a hydraulic winch powered by high-pressure nitrogen gas - no generator or electric power necessary.
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