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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).
In addition, bunker design was arranged in "series", the 1939 designs with A and B thickness falling into the 100 series. Later 400 , 500 and 600 series were created, the new series were more designed to enable the casemate to be capable of taking captured weapons than to be stronger, the 400 series was designed for Czechoslovakian weapons.
On D-Day, a mixed group of forced labourers held by German forces take shelter from the bombardment inside a German bunker, but are then entombed when the entrances are blocked by shelling damage. By coincidence, the bunker is a storehouse, so the prisoners have enough food and wine to last them for years.
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There’s a whole city’s worth of stuff underneath the White House, complete with a lasting oxygen supply and midnight snacks for weeks.
Both Mount Weather and the now deactivated bunker at The Greenbrier were featured in the A&E documentary Bunkers. The documentary, first broadcast on October 23, 2001, features interviews with engineers and political and intelligence analysts, and compared The Greenbrier and Mount Weather to Saddam Hussein's control bunker buried beneath Baghdad.
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.
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