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The 930 m 2 (10,000 sq ft) shelter is composed of 42 school buses, which were buried underground as patterns for concrete that was then poured over to provide the main structure, onto which up to 5 meters (14 feet) of earth were piled to provide fallout protection.
The first completed shelter, located in Indiana, [5] was built during the Cold War to withstand a near direct hit from a 20-megaton nuclear bomb. [6] With accommodations for 80 people, the Indiana complex has a few spots left due to member relocations and family changes.
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Authorities are working to determine whether human remains found in a concrete “bunker” underneath a man’s California mobile home belonged to a missing couple who lived next door at a nudist ...
Blast doors in a missile control bunker at Minot Air Force Base, North Dakota. The 25-ton blast door in the Cheyenne Mountain nuclear bunker is the main entrance to another blast door (background) beyond which the side tunnel branches into access tunnels to the main chambers.
The underground 4-storey bunker required 32,000 tonnes of concrete and 5,000 tonnes of steel. The structure was capable of withstanding a nuclear blast of up to 5 megatons from 1.8 km (1.1 mi) away. It had massive blast doors at the surface, as well as extensive air filters to prevent radiation infiltration. [9]
During World War I, Sir Ernest William Moir produced a design for concrete machine-gun pillboxes [5] constructed from a system of interlocking precast concrete blocks, with a steel roof. Around 1,500 Moir pillboxes were eventually produced (with blocks cast at Richborough in Kent) and sent to the Western Front in 1918.