A Camouflet is military science term to describe an artificial cavern created by an explosion to undermine a structure. If the explosion reaches the surface then it is called a crater.
The term originated in a counter mine dug by defenders to defend against the undermining of a fortresses walls during a siege. The defenders would dig a tunnel under the attackers tunnel. An explosive charge would be set off to create a camouflet (cavern) that would collapse the attackers tunnel. For the Boston area punk band see Siege (band). ...
More recently the term has been used to describe the effects of very large bombs like the Grand Slam bomb which are designed to penetrate under a structure and create a camouflet to undermine the foundations of very large structures. A British 22,000 lb Grand Slam bomb The Grand Slam (Earthquake) bomb was developed by Barnes Wallis in late 1944. ...
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