Camouflet

A camouflet, in military science, is an artificial cavern created by an explosion. If the explosion reaches the surface then it is called a crater. The term was originally defined as a countermine dug by defenders to prevent the undermining of a fortress`s walls during a siege. The defenders would dig a tunnel under the attackers` tunnel. An exp.....
Found on http://en.wikipedia.org/wiki/Camouflet

camouflet

mine used to destroy underground enemy emplacement
Found on http://phrontistery.info/c.html
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