A bunker is a defensive fortification designed to protect people and valued materials from falling bombs, artillery, or other attacks. Bunkers are almost always underground, in contrast to blockhouses which are mostly above ground. [1]

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A heavily fortified military structure is generally referred to as a bunker. Bunkers have been used throughout history as a means to protect occupants or contents against all manner of threats, like military force, natural disasters, chemicals and radiation.

Bunkers of all Shapes and Sizes in 32 Images - War History Online

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