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Bunkers deflect the blast wave from nearby explosions to prevent ear and internal injuries to people sheltering in the bunker. While frame buildings collapse from as little as 21 kPa (3 psi ; 0.21 bar ) of overpressure , bunkers are regularly constructed to survive over 1,000 kPa (150 psi; 10 bar).
Ventilation openings in a bunker must be protected by blast valves. A blast valve is closed by a shock wave, but otherwise remains open. If the bunker is in a built-up area, it may include water-cooling or an immersion tube and breathing tubes to protect inhabitants from fire storms. In these cases, the secondary exit is also most useful.
The first post-war photos of the interior of the Führerbunker were taken in July 1945. On 4 July, American writer James P. O'Donnell toured the bunker after giving the Soviet guard a pack of cigarettes. [60] [61] Many soldiers, politicians, and diplomats visited the bunker complex in the following days and months.
There’s a whole city’s worth of stuff underneath the White House, complete with a lasting oxygen supply and midnight snacks for weeks.
While these forms of bomb shelters are equally amenable to civilians and military use, a bunker is more commonly associated with military use. A bunker may be hastily assembled as part of an ongoing military advance, or to hold a line. Bunkers have also been popular with the survivalism subculture.
The zone contained the Führer Bunker and ten other camouflaged bunkers built from 2-metre-thick (6 ft 7 in) steel-reinforced concrete. These shelters protected members of Hitler's inner circle such as Martin Bormann, Hermann Göring, Wilhelm Keitel, and Alfred Jodl. Hitler's accommodation was on the shaded northern side of the Führer Bunker.
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Meta's Mark Zuckerberg and his wife Priscilla Chan reportedly plan to build a 5,000-square-foot underground bunker on their Hawaii property.