Скачать или смотреть The Heaviest Door Ever Built _ And One Person Could Move It,

In 1979, engineers at Lawrence Livermore National Laboratory in California built one of the heaviest doors ever installed in a research facility. The massive blast-resistant door was 8 feet thick, nearly 12 feet wide, and weighed about 97,000 pounds (44,000 kilograms). Despite its enormous size, the door was so precisely engineered that a single person could open and close it.
During the Cold War, facilities like Lawrence Livermore were focused on advanced scientific research and high-energy experiments. To ensure safety, buildings were designed with extreme protective features. Heavy doors like this were created to absorb powerful shockwaves and isolate sensitive test areas.
This period produced some of the most impressive engineering projects in history, including underground laboratories, reinforced structures, and secure research complexes. The famous Livermore blast door stands as a reminder of how science and engineering responded to the challenges and fears of the Cold War era.
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